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Kelly, C.M.R.; Barker, N.P.; Villet, M.H.; Broadley, D.G.; Branch, W.R. 2008 The snake family Psammophiidae (Reptilia: Serpentes): phylogenetics and species delimitation in the African sand snakes (Psammophis Boie, 1825) and allied genera. Molecular Phylogenetics & Evolution 47(3): 1045-1060.