Medycyna Weterynaryjna > 1989 > 45 > 8
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journal ISSN : | 0025-8628 |
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Bibliography
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1. Aalbaek В.: Acta vet. scand. 13, 228, 1972.
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2. Alexander T. J., Taylor D. J.: Vet. Rec. 85, 59, 1969.
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3. Alexander T. J.. Wellstead P. G., Hudson M. J.: Proc. Int. Pig Vet. Soc. Congress, Ames, Iowa 1976.