By Heymann David   in Journal of Human Development

ISSN:1464-9888|4|2|191-207

Routledge Ltd‎(2003)‎

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By Spinaci Sergio   Heymann David   in Development

ISSN:1461-7072|44|1|66-72

Palgrave Macmillan Ltd‎(2001)‎

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By Heymann David L   Sutter Roland W   Aylward R Bruce   in Future Virology

ISSN:1746-0794|1|2|181-188

Future Medicine‎(2006)‎

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