References
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- Morgan , K. L. 1991 . Aural hematomata, cauliflower ears and Psoroptes ovis in sheep . Vet. Rec. , 128 : 459 – 460 .
- Morgan , K. L. 1992 . Parasitic otitis in sheep associated with Psoroptes infestation: a clinical and epidemiological study . Vet. Rec. , 130 : 530 – 532 .