Diversifying into the branches: Species boundaries in African green and bush snakes, Philothamnus (Serpentes: Colubridae).
Engelbrecht HM, Branch WR, Greenbaum E, Alexander GJ, Jackson K, Burger M, Conradie W, Kusamba C, Zassi-Boulou AG, Tolley KA. Diversifying into the branches: Species boundaries in African green and bush snakes, Philothamnus (Serpentes: Colubridae). Mol Phylogenet Evol. 2019 01; 130:357-365.