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Tutt Jb,. (1944). Vet J, 100, 69–80.
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Lieberman, D. (1993).
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McGreevy, P. D. (2004).
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McLean, A. N. (2003).
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Mills, D. S., & Nankervis, K. J. (1999).
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Parelli, P. (1993).
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Roberts, M. (1997).
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Waring, G. H. (2003).
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().9(5), 265.
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