Zimkus, B.M. and Larson, J.G. 2011. Examination of the molecular relationships of sand frogs (Anura: Pyxicephalidae: Tomopterna) and resurrection of two species from the Horn of Africa. Zootaxa. 2933, 1 (Jun. 2011), 27–45. DOI:https://doi.org/10.11646/zootaxa.2933.1.2.