Vet Parasitol. 1985 Oct; 18(3):251-64.

[Vet Parasitol. 1985]

Vet Clin North Am Food Anim Pract. 1986 Jul; 2(2):397-409.

[Vet Clin North Am Food Anim Pract. 1986]

Vet Rec. 1967 Sep 30; 81(14):332-5.

[Vet Rec. 1967]

Vet Clin North Am Food Anim Pract. 2006 Nov; 22(3):673-93.

[Vet Clin North Am Food Anim Pract. 2006]

Vet Clin North Am Large Anim Pract. 1984 Mar; 6(1):3-26.

[Vet Clin North Am Large Anim Pract. 1984]