Collins E, Boon C (eds.): Livestock environment IV : Fourth International Symposium, University of Warwick, Coventry, England, 6-9 July 1993. ASAE Publication, volume 93-3; American Society of Agricultural Engineers; pp. 609-616; ISBN 978-0-929355-41-2
U.S. Department of Health and Human Services (HHS), U.S. Public Health Service (PHS), Centers for Disease Control and Prevention (CDC), National Institute for Occupational Safety and Health (NIOSH),
HETA 93-1034-2447: 1-12
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