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Morrow AN, Heron ID, Walker AR, Robinson JL.Morrow AN, et al. Among authors: walker ar.Zentralbl Veterinarmed B. 1989 Jun;36(4):241-9. doi: 10.1111/j.1439-0450.1989.tb00598.x.Zentralbl Veterinarmed B. 1989.PMID: 2763757
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Poermadjaja B, Ambrose N, Walker A, Morrow A.Poermadjaja B, et al.Rev Elev Med Vet Pays Trop. 1993;46(1-2):277-82.Rev Elev Med Vet Pays Trop. 1993.PMID: 8134642
Lloyd CM, Walker AR.Lloyd CM, et al. Among authors: walker ar.Rev Elev Med Vet Pays Trop. 1993;46(1-2):313-6.Rev Elev Med Vet Pays Trop. 1993.PMID: 8134648
Lloyd CM, Walker AR.Lloyd CM, et al. Among authors: walker ar.Vet Parasitol. 1995 Aug;59(1):59-67. doi: 10.1016/0304-4017(95)94781-z.Vet Parasitol. 1995.PMID: 7571338