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L. Lisborg
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Nest-building, behavioural disturbances and heart rate in farrowing sows kept in crates and Schmid pens
K. Vestergaard, J. Vaníček, B. I. Damm, 2003 .
A model of feather pecking development which relates to dustbathing in the fowl
K. Vestergaard, L. Lisborg, 1993 .