By Beerda B.   Schilder M.B.H.   Janssen N.S.C.R.M.   Mol J.A.   in Hormones and Behavior

ISSN:0018-506X|30|3|272-279

Academic Press‎(1996)‎

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By Beerda B   Schilder M B H   van Hooff J A R A M   de Vries H W   Mol J A   in Animal Welfare

ISSN:0962-7286|9|1|49-62

Universities Federation for Animal Welfare‎(2000)‎

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