By Baldridge J.R.   Ward J.R.   in Vaccine

ISSN:0264-410X|15|4|395-401

Elsevier‎(1997)‎

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By Baldridge J.R.   Yorgensen Y.   Ward J.R.   Ulrich J.T.   in Vaccine

ISSN:0264-410X|18|22|2416-2425

Elsevier‎(2000)‎

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By TISDELL J. G.   WARD J. R.   in Society and Natural Resources

ISSN:1521-0723|16|1|61-75

Routledge Ltd‎(2003)‎

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