By Jeffreys M   Warren R   Davey Smith G   Gunnell D   in British Journal of Radiology

ISSN:0007-1285|76|908|561-563

British Institute of Radiology‎(2003)‎

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By Jeffreys M   Warren R   Highnam R   Davey Smith G   in British Journal of Radiology

ISSN:0007-1285|79|941|378-382

British Institute of Radiology‎(2006)‎

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By Beets P.N.   Gilchrist K.   Jeffreys M.P.   in Forest Ecology and Management

ISSN:0378-1127|145|3|173-180

Elsevier‎(2001)‎

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