By Walker J.F.   Vatter H.G.   in Futures

ISSN:0016-3287|32|2|121-129

Elsevier‎(2000)‎

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By Stewart K. E.   Cianfrini L. R.   Walker J. F.   in AIDS Care

ISSN:1360-0451|17|3|350-358

Routledge Ltd‎(2005)‎

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