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Butcher GA, Clark IA.Butcher GA, et al. Among authors: clark ia.Parasitology. 1990 Dec;101 Pt 3:321-6. doi: 10.1017/s0031182000060509.Parasitology. 1990.PMID: 2092288
Clark IA, Jacobson LS.Clark IA, et al.Ann Trop Med Parasitol. 1998 Jun;92(4):483-8. doi: 10.1080/00034989859456.Ann Trop Med Parasitol. 1998.PMID: 9683899Review.