By de Visser R.   Grierson J.   in AIDS Care

ISSN:1360-0451|14|5|599-606

Routledge Ltd‎(2002)‎

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By De Visser R. O.   Smith A. M. A.   in Psychology, Health and Medicine

ISSN:1465-3966|6|1|41-46

Routledge Ltd‎(2001)‎

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By Warringa J.W.   de Visser R.   Kreuzer A.D.H.   in Annals of Botany

ISSN:0305-7364|82|6|835-841

Oxford University Press‎(1998)‎

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