By Hennessy M.   Mercier M.M.   Williams S.P.   Arno J.N.   in Evaluation and Program Planning

ISSN:0149-7189|25|2|117-124

Elsevier‎(2002)‎

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By Robertson J.S.   Cook P.   Attwell A.-M.   Williams S.P.   in Vaccine

ISSN:0264-410X|13|16|1583-1588

Elsevier‎(1995)‎

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By Miller S.   Exner T. M.   Williams S. P.   Ehrhardt A. A.   in AIDS Care

ISSN:1360-0451|12|5|603-612

Routledge Ltd‎(2000)‎

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