DOAN, T. M., A. J. MASON, T. A. CASTOE, M. SASA, and C. L. PARKINSON. “A Cryptic Palm-Pitviper Species (Squamata: Viperidae: <em>Bothriechis</em>) from the Costa Rican Highlands, With Notes on the Variation Within B. Nigroviridis ”. Zootaxa, vol. 4138, no. 2, July 2016, pp. 271–290, doi:10.11646/zootaxa.4138.2.3.