Walker, Pegram & Keirans 1995. Rhipicephalus interventus sp. nov. (Acari: Ixodidae), a new tick species closely related to Rhipicephalus tricuspis Donitz, 1906 and Rhipicephalus lunulatus Neumann, 1907, from east and central Africa. Onderstepoort Journal of Veterinary Research, 62(2), June 1995: 89-95