By Harper David J.   in Journal of Mental Health

ISSN:1360-0567|4|4|347-358

Informa Healthcare‎(1995)‎

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By Harper David J.   Koychev Ivan   Sun Yixing   Pirie Iain   in Information Retrieval

ISSN:1386-4564|7|3-4|265-290

Springer Publishing Company ‎(2004)‎

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