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<ref>
<element-citation publication-type="journal" publication-format="print">
<name><surname>Llanos De La Torre Quiralte</surname>
<given-names>M</given-names></name>
<name><surname>Garijo Ayestaran</surname>
<given-names>M</given-names></name>
<name><surname>Poch Olive</surname>
<given-names>ML</given-names></name>
<article-title xml:lang="es">Evolucion de la mortalidad
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<trans-title xml:lang="en">Evolution of the infant
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<mixed-citation publication-type="journal" publication-format="print">
<string-name><surname>Llanos De La Torre Quiralte</surname>,
<given-names>M</given-names></string-name>,
<string-name><surname>Garijo Ayestaran</surname>,
<given-names>M</given-names></string-name>,
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<given-names>ML</given-names></string-name>.
<article-title xml:lang="es">Evolucion de la mortalidad
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<given-names>JA</given-names></string-name>,
<string-name><surname>Trotter</surname>,
<given-names>IS</given-names></string-name>,
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