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