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Observations on the infectivity and pathogenicity of three isolates of ostertagia spp sens lato in calves por Al Saqur, I., Armour, J., Bairden, K., Dunn, A.M., Jennings, F.W., Murray, M.

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Experimental studies on the interaction between infections of Ostertagia leptospicularis and other bovine Ostertagia species por Al Sagur, I., Armour, J., Bairden, K., Dunn, A.M., Jennings, F.W., Murray, M.

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