By Gustafsson G.   von Wachenfelt E.   in Journal of Agricultural Engineering Research

ISSN:0021-8634|75|1|17-25

Academic Press‎(2000)‎

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By Von Wachenfelt E.   Pedersen S.   Gustafsson G.   in British Poultry Science

ISSN:1466-1799|42|2|171-179

Taylor & Francis Ltd‎(2001)‎

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