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Sobre el estudio del impacto de introducir una vacuna en el..:

Amela Heras Carmen
http://www.scielosp.org/scielo.php?script=sci_arttext&pid=S1135-57272002000300001.  , 2002
Link: https://doaj.org/article/d259f19960604315a1a1aa66f9f5d..