@article{lynch_2009,  title={Snakes of the genus Oxyrhopus (Colubridae: Squamata) in Colombia: taxonomy and geographic variation},  volume={49},  ISSN={0031-1049},  url={https://doi.org/10.1590/S0031-10492009002500001},  DOI={10.1590/S0031-10492009002500001},  number={25},  journal={Papéis Avulsos de Zoologia},  publisher={Museu de Zoologia da Universidade de São Paulo},  author={Lynch, John D.},  year={2009},  pages={319–337} }