<?xml version="1.0" encoding="UTF-8"?>
<!-- Generated by Fujitsu XWand 7.0.0025  (0018_w_27) -->
<linkbase xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd http://www.xbrl.org/2004/ref ref-2004-08-10.xsd" xmlns:ref="http://www.xbrl.org/2004/ref" xmlns:ipp-gen-con="http://www.cnmv.es/ipp/gen/con/1-2005/2005-06-30">
  <referenceLink xlink:type="extended" xlink:role="http://www.xbrl.org/2003/role/link">
    <loc xlink:type="locator" xlink:href="ipp-gen-con-2005-06-30.xsd#ipp-gen-con_AccionesSociedadDominanteLargoPlazo" xlink:label="reference_AccionesSociedadDominanteLargoPlazo_1086288546772_1" xlink:title="reference_AccionesSociedadDominanteLargoPlazo"/>
    <reference xlink:type="resource" xlink:label="reference_AccionesSociedadDominanteLargoPlazo_1086288546772_2" xlink:role="http://www.xbrl.org/2003/role/presentationRef" xlink:title="reference_AccionesSociedadDominanteLargoPlazo" id="reference_AccionesSociedadDominanteLargoPlazo_1086288546772_2">
      <ref:Name>BOE</ref:Name>
      <ref:Number>82</ref:Number>
      <ref:Chapter>5478</ref:Chapter>
      <ref:Page>11645</ref:Page>
      <ref:IssueDate>Miércoles 6 abril 2005</ref:IssueDate>
      <ref:Section>Anexo I</ref:Section>
      <ref:Subsection>IV.</ref:Subsection>
      <ref:Paragraph>B)</ref:Paragraph>
      <ref:Subparagraph>V.</ref:Subparagraph>
      <ref:Note>1250</ref:Note>
    </reference>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="reference_AccionesSociedadDominanteLargoPlazo_1086288546772_1" xlink:to="reference_AccionesSociedadDominanteLargoPlazo_1086288546772_2" xlink:title="reference: AccionesSociedadDominanteLargoPlazo to reference_AccionesSociedadDominanteLargoPlazo"/>
    <reference xlink:type="resource" xlink:label="reference_AccionesSociedadDominanteLargoPlazo_1086288773378_0" xlink:role="http://www.xbrl.org/2003/role/presentationRef" xlink:title="reference_AccionesSociedadDominanteLargoPlazo" id="reference_AccionesSociedadDominanteLargoPlazo_1086288773378_0">
      <ref:Name>BOE</ref:Name>
      <ref:Number>82</ref:Number>
      <ref:Chapter>5478</ref:Chapter>
      <ref:Page>11647</ref:Page>
      <ref:IssueDate>Miércoles 6 abril 2005</ref:IssueDate>
      <ref:Section>Anexo I</ref:Section>
      <ref:Subsection>VI.</ref:Subsection>
      <ref:Paragraph>A)</ref:Paragraph>
      <ref:Subparagraph>VII.</ref:Subparagraph>
      <ref:Note>5060</ref:Note>
    </reference>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="reference_AccionesSociedadDominanteLargoPlazo_1086288546772_1" xlink:to="reference_AccionesSociedadDominanteLargoPlazo_1086288773378_0" xlink:title="reference: AccionesSociedadDominanteLargoPlazo to reference_AccionesSociedadDominanteLargoPlazo"/>
    <loc xlink:type="locator" xlink:href="ipp-gen-con-2005-06-30.xsd#ipp-gen-con_AccionesSociedadDominanteCortoPlazo" xlink:label="reference_AccionesSociedadDominanteCortoPlazo_1086288950813_0" xlink:title="reference_AccionesSociedadDominanteCortoPlazo"/>
    <reference xlink:type="resource" xlink:label="reference_AccionesSociedadDominanteCortoPlazo_1086288950813_1" xlink:role="http://www.xbrl.org/2003/role/presentationRef" xlink:title="reference_AccionesSociedadDominanteCortoPlazo" id="reference_AccionesSociedadDominanteCortoPlazo_1086288950813_1">
      <ref:Name>BOE</ref:Name>
      <ref:Number>82</ref:Number>
      <ref:Chapter>5478</ref:Chapter>
      <ref:Page>11647</ref:Page>
      <ref:IssueDate>Miércoles 6 abril 2005</ref:IssueDate>
      <ref:Section>Anexo I</ref:Section>
      <ref:Subsection>VI.</ref:Subsection>
      <ref:Paragraph>C)</ref:Paragraph>
      <ref:Subparagraph>IV.</ref:Subparagraph>
      <ref:Note>5130</ref:Note>
    </reference>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="reference_AccionesSociedadDominanteCortoPlazo_1086288950813_0" xlink:to="reference_AccionesSociedadDominanteCortoPlazo_1086288950813_1" xlink:title="reference: AccionesSociedadDominanteCortoPlazo to reference_AccionesSociedadDominanteCortoPlazo"/>
    <reference xlink:type="resource" xlink:label="reference_AccionesSociedadDominanteCortoPlazo_1086289098295_0" xlink:role="http://www.xbrl.org/2003/role/presentationRef" xlink:title="reference_AccionesSociedadDominanteCortoPlazo" id="reference_AccionesSociedadDominanteCortoPlazo_1086289098295_0">
      <ref:Name>BOE</ref:Name>
      <ref:Number>82</ref:Number>
      <ref:Chapter>5478</ref:Chapter>
      <ref:Page>11645</ref:Page>
      <ref:IssueDate>Miércoles 6 abril 2005</ref:IssueDate>
      <ref:Section>Anexo I</ref:Section>
      <ref:Subsection>IV.</ref:Subsection>
      <ref:Paragraph>E)</ref:Paragraph>
      <ref:Note>V.</ref:Note>
    </reference>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="reference_AccionesSociedadDominanteCortoPlazo_1086288950813_0" xlink:to="reference_AccionesSociedadDominanteCortoPlazo_1086289098295_0" xlink:title="reference: AccionesSociedadDominanteCortoPlazo to reference_AccionesSociedadDominanteCortoPlazo"/>
    <loc xlink:type="locator" xlink:href="ipp-gen-con-2005-06-30.xsd#ipp-gen-con_ResultadosConversion" xlink:label="reference_ResultadosConversion_1086289273187_0" xlink:title="reference_ResultadosConversion"/>
    <reference xlink:type="resource" xlink:label="reference_ResultadosConversion_1086289273187_1" xlink:role="http://www.xbrl.org/2003/role/presentationRef" xlink:title="reference_ResultadosConversion" id="reference_ResultadosConversion_1086289273187_1">
      <ref:Name>BOE</ref:Name>
      <ref:Number>82</ref:Number>
      <ref:Chapter>5478</ref:Chapter>
      <ref:Page>11646</ref:Page>
      <ref:IssueDate>Miércoles 6 abril 2005</ref:IssueDate>
      <ref:Section>Anexo I</ref:Section>
      <ref:Subsection>V.</ref:Subsection>
      <ref:Note>1980</ref:Note>
    </reference>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="reference_ResultadosConversion_1086289273187_0" xlink:to="reference_ResultadosConversion_1086289273187_1" xlink:title="reference: ResultadosConversion to reference_ResultadosConversion"/>
    <loc xlink:type="locator" xlink:href="ipp-gen-con-2005-06-30.xsd#ipp-gen-con_ParticipacionResultadosSociedadesPuestasEquivalencia" xlink:label="reference_ParticipacionResultadosSociedadesPuestasEquivalencia_1086289392078_0" xlink:title="reference_ParticipacionResultadosSociedadesPuestasEquivalencia"/>
    <reference xlink:type="resource" xlink:label="reference_ParticipacionResultadosSociedadesPuestasEquivalencia_1086289392078_1" xlink:role="http://www.xbrl.org/2003/role/presentationRef" xlink:title="reference_ParticipacionResultadosSociedadesPuestasEquivalencia" id="reference_ParticipacionResultadosSociedadesPuestasEquivalencia_1086289392078_1">
      <ref:Name>BOE</ref:Name>
      <ref:Number>82</ref:Number>
      <ref:Chapter>5478</ref:Chapter>
      <ref:Page>11646</ref:Page>
      <ref:IssueDate>Miércoles 6 abril 2005</ref:IssueDate>
      <ref:Section>Anexo I</ref:Section>
      <ref:Subsection>V.</ref:Subsection>
      <ref:Note>1990</ref:Note>
    </reference>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="reference_ParticipacionResultadosSociedadesPuestasEquivalencia_1086289392078_0" xlink:to="reference_ParticipacionResultadosSociedadesPuestasEquivalencia_1086289392078_1" xlink:title="reference: ParticipacionResultadosSociedadesPuestasEquivalencia to reference_ParticipacionResultadosSociedadesPuestasEquivalencia"/>
    <loc xlink:type="locator" xlink:href="ipp-gen-con-2005-06-30.xsd#ipp-gen-con_AmortizacionFondoComercioConsolidacion" xlink:label="reference_AmortizacionFondoComercioConsolidacion_1086289518009_0" xlink:title="reference_AmortizacionFondoComercioConsolidacion"/>
    <reference xlink:type="resource" xlink:label="reference_AmortizacionFondoComercioConsolidacion_1086289518009_1" xlink:role="http://www.xbrl.org/2003/role/presentationRef" xlink:title="reference_AmortizacionFondoComercioConsolidacion" id="reference_AmortizacionFondoComercioConsolidacion_1086289518009_1">
      <ref:Name>BOE</ref:Name>
      <ref:Number>82</ref:Number>
      <ref:Chapter>5478</ref:Chapter>
      <ref:Page>11646</ref:Page>
      <ref:IssueDate>Miércoles 6 abril 2005</ref:IssueDate>
      <ref:Section>Anexo I</ref:Section>
      <ref:Subsection>V.</ref:Subsection>
      <ref:Note>2000</ref:Note>
    </reference>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="reference_AmortizacionFondoComercioConsolidacion_1086289518009_0" xlink:to="reference_AmortizacionFondoComercioConsolidacion_1086289518009_1" xlink:title="reference: AmortizacionFondoComercioConsolidacion to reference_AmortizacionFondoComercioConsolidacion"/>
    <loc xlink:type="locator" xlink:href="ipp-gen-con-2005-06-30.xsd#ipp-gen-con_ReversionDiferenciasNegativasConsolidacion" xlink:label="reference_ReversionDiferenciasNegativasConsolidacion_1086289613276_0" xlink:title="reference_ReversionDiferenciasNegativasConsolidacion"/>
    <reference xlink:type="resource" xlink:label="reference_ReversionDiferenciasNegativasConsolidacion_1086289613276_1" xlink:role="http://www.xbrl.org/2003/role/presentationRef" xlink:title="reference_ReversionDiferenciasNegativasConsolidacion" id="reference_ReversionDiferenciasNegativasConsolidacion_1086289613276_1">
      <ref:Name>BOE</ref:Name>
      <ref:Number>82</ref:Number>
      <ref:Chapter>5478</ref:Chapter>
      <ref:Page>11646</ref:Page>
      <ref:IssueDate>Miércoles 6 abril 2005</ref:IssueDate>
      <ref:Section>Anexo I</ref:Section>
      <ref:Subsection>V.</ref:Subsection>
      <ref:Note>2010</ref:Note>
    </reference>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="reference_ReversionDiferenciasNegativasConsolidacion_1086289613276_0" xlink:to="reference_ReversionDiferenciasNegativasConsolidacion_1086289613276_1" xlink:title="reference: ReversionDiferenciasNegativasConsolidacion to reference_ReversionDiferenciasNegativasConsolidacion"/>
    <loc xlink:type="locator" xlink:href="ipp-mas-pat-2005-06-30.xsd#ipp-mas-pat_OtrosActivosCorrientes" xlink:label="reference_OtrosActivosCorrientes_1086289731886_0" xlink:title="reference_OtrosActivosCorrientes"/>
    <reference xlink:type="resource" xlink:label="reference_OtrosActivosCorrientes_1086289731886_1" xlink:role="http://www.xbrl.org/2003/role/presentationRef" xlink:title="reference_OtrosActivosCorrientes" id="reference_OtrosActivosCorrientes_1086289731886_1">
      <ref:Name>BOE</ref:Name>
      <ref:Number>82</ref:Number>
      <ref:Chapter>5478</ref:Chapter>
      <ref:Page>11646</ref:Page>
      <ref:IssueDate>Miércoles 6 abril 2005</ref:IssueDate>
      <ref:Section>Anexo I</ref:Section>
      <ref:Subsection>IV.</ref:Subsection>
      <ref:Paragraph>B)</ref:Paragraph>
      <ref:Subparagraph>VI.</ref:Subparagraph>
      <ref:Note>4160</ref:Note>
    </reference>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="reference_OtrosActivosCorrientes_1086289731886_0" xlink:to="reference_OtrosActivosCorrientes_1086289731886_1" xlink:title="reference: OtrosActivosCorrientes to reference_OtrosActivosCorrientes"/>
    <reference xlink:type="resource" xlink:label="reference_OtrosActivosCorrientes_1086289998730_0" xlink:role="http://www.xbrl.org/2003/role/presentationRef" xlink:title="reference_OtrosActivosCorrientes" id="reference_OtrosActivosCorrientes_1086289998730_0">
      <ref:Name>BOE</ref:Name>
      <ref:Number>82</ref:Number>
      <ref:Chapter>5478</ref:Chapter>
      <ref:Page>11647</ref:Page>
      <ref:IssueDate>Miércoles 6 abril 2005</ref:IssueDate>
      <ref:Section>Anexo I</ref:Section>
      <ref:Subsection>VI.</ref:Subsection>
      <ref:Paragraph>C)</ref:Paragraph>
      <ref:Subparagraph>V.</ref:Subparagraph>
      <ref:Note>5140</ref:Note>
    </reference>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="reference_OtrosActivosCorrientes_1086289731886_0" xlink:to="reference_OtrosActivosCorrientes_1086289998730_0" xlink:title="reference: OtrosActivosCorrientes to reference_OtrosActivosCorrientes"/>
    <loc xlink:type="locator" xlink:href="ipp-gen-con-2005-06-30.xsd#ipp-gen-con_ActivosBiologicosCorrientes" xlink:label="reference_ActivosBiologicosCorrientes_1086290206188_0" xlink:title="reference_ActivosBiologicosCorrientes"/>
    <reference xlink:type="resource" xlink:label="reference_ActivosBiologicosCorrientes_1086290206188_1" xlink:role="http://www.xbrl.org/2003/role/presentationRef" xlink:title="reference_ActivosBiologicosCorrientes" id="reference_ActivosBiologicosCorrientes_1086290206188_1">
      <ref:Name>BOE</ref:Name>
      <ref:Number>82</ref:Number>
      <ref:Chapter>5478</ref:Chapter>
      <ref:Page>11646</ref:Page>
      <ref:IssueDate>Miércoles 6 abril 2005</ref:IssueDate>
      <ref:Section>Anexo I</ref:Section>
      <ref:Subsection>IV.</ref:Subsection>
      <ref:Paragraph>B)</ref:Paragraph>
      <ref:Subparagraph>I.</ref:Subparagraph>
      <ref:Note>4100</ref:Note>
    </reference>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="reference_ActivosBiologicosCorrientes_1086290206188_0" xlink:to="reference_ActivosBiologicosCorrientes_1086290206188_1" xlink:title="reference: ActivosBiologicosCorrientes to reference_ActivosBiologicosCorrientes"/>
    <loc xlink:type="locator" xlink:href="ipp-gen-con-2005-06-30.xsd#ipp-gen-con_ActivosBiologicosNoCorrientes" xlink:label="reference_ActivosBiologicosNoCorrientes_1086290345539_0" xlink:title="reference_ActivosBiologicosNoCorrientes"/>
    <reference xlink:type="resource" xlink:label="reference_ActivosBiologicosNoCorrientes_1086290345539_1" xlink:role="http://www.xbrl.org/2003/role/presentationRef" xlink:title="reference_ActivosBiologicosNoCorrientes" id="reference_ActivosBiologicosNoCorrientes_1086290345539_1">
      <ref:Name>BOE</ref:Name>
      <ref:Number>82</ref:Number>
      <ref:Chapter>5478</ref:Chapter>
      <ref:Page>11646</ref:Page>
      <ref:IssueDate>Miércoles 6 abril 2005</ref:IssueDate>
      <ref:Section>Anexo I</ref:Section>
      <ref:Subsection>IV.</ref:Subsection>
      <ref:Paragraph>A)</ref:Paragraph>
      <ref:Subparagraph>VII.</ref:Subparagraph>
      <ref:Note>4060</ref:Note>
    </reference>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="reference_ActivosBiologicosNoCorrientes_1086290345539_0" xlink:to="reference_ActivosBiologicosNoCorrientes_1086290345539_1" xlink:title="reference: ActivosBiologicosNoCorrientes to reference_ActivosBiologicosNoCorrientes"/>
    <loc xlink:type="locator" xlink:href="ipp-gen-con-2005-06-30.xsd#ipp-gen-con_OtrasReservas" xlink:label="reference_OtrasReservas_1086290522493_0" xlink:title="reference_OtrasReservas"/>
    <reference xlink:type="resource" xlink:label="reference_OtrasReservas_1086290522493_1" xlink:role="http://www.xbrl.org/2003/role/presentationRef" xlink:title="reference_OtrasReservas" id="reference_OtrasReservas_1086290522493_1">
      <ref:Name>BOE</ref:Name>
      <ref:Number>82</ref:Number>
      <ref:Chapter>5478</ref:Chapter>
      <ref:Page>11646</ref:Page>
      <ref:IssueDate>Miércoles 6 abril 2005</ref:IssueDate>
      <ref:Section>Anexo I</ref:Section>
      <ref:Subsection>IV.</ref:Subsection>
      <ref:Paragraph>A)</ref:Paragraph>
      <ref:Subparagraph>II.</ref:Subparagraph>
      <ref:Note>4220</ref:Note>
    </reference>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="reference_OtrasReservas_1086290522493_0" xlink:to="reference_OtrasReservas_1086290522493_1" xlink:title="reference: OtrasReservas to reference_OtrasReservas"/>
    <loc xlink:type="locator" xlink:href="ipp-gen-con-2005-06-30.xsd#ipp-gen-con_ResultadoDeterioroReversionDeterioroActivosNeto" xlink:label="reference_ResultadoDeterioroReversionDeterioroActivosNeto_1086290656456_0" xlink:title="reference_ResultadoDeterioroReversionDeterioroActivosNeto"/>
    <reference xlink:type="resource" xlink:label="reference_ResultadoDeterioroReversionDeterioroActivosNeto_1086290656456_1" xlink:role="http://www.xbrl.org/2003/role/presentationRef" xlink:title="reference_ResultadoDeterioroReversionDeterioroActivosNeto" id="reference_ResultadoDeterioroReversionDeterioroActivosNeto_1086290656456_1">
      <ref:Name>BOE</ref:Name>
      <ref:Number>82</ref:Number>
      <ref:Chapter>5478</ref:Chapter>
      <ref:Page>11647</ref:Page>
      <ref:IssueDate>Miércoles 6 abril 2005</ref:IssueDate>
      <ref:Section>Anexo I</ref:Section>
      <ref:Subsection>V.</ref:Subsection>
      <ref:Note>4630</ref:Note>
    </reference>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="reference_ResultadoDeterioroReversionDeterioroActivosNeto_1086290656456_0" xlink:to="reference_ResultadoDeterioroReversionDeterioroActivosNeto_1086290656456_1" xlink:title="reference: ResultadoDeterioroReversionDeterioroActivosNeto to reference_ResultadoDeterioroReversionDeterioroActivosNeto"/>
    <loc xlink:type="locator" xlink:href="ipp-gen-con-2005-06-30.xsd#ipp-gen-con_AjustesValoracion" xlink:label="reference_AjustesValoracion_1086290807083_0" xlink:title="reference_AjustesValoracion"/>
    <reference xlink:type="resource" xlink:label="reference_AjustesValoracion_1086290807083_1" xlink:role="http://www.xbrl.org/2003/role/presentationRef" xlink:title="reference_AjustesValoracion" id="reference_AjustesValoracion_1086290807083_1">
      <ref:Name>BOE</ref:Name>
      <ref:Number>82</ref:Number>
      <ref:Chapter>5478</ref:Chapter>
      <ref:Page>11647</ref:Page>
      <ref:IssueDate>Miércoles 6 abril 2005</ref:IssueDate>
      <ref:Section>Anexo I</ref:Section>
      <ref:Subsection>VI.</ref:Subsection>
      <ref:Paragraph>A)</ref:Paragraph>
      <ref:Subparagraph>V.</ref:Subparagraph>
      <ref:Note>5230</ref:Note>
    </reference>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="reference_AjustesValoracion_1086290807083_0" xlink:to="reference_AjustesValoracion_1086290807083_1" xlink:title="reference: AjustesValoracion to reference_AjustesValoracion"/>
  </referenceLink>
</linkbase>
