Z. T. Nagy, R. Lawson, U. Joger, M. Wink: Molecular systematics of racers, whipsnakes and relatives (Reptilia: Colubridae) using mitochondrial and nuclear markers. In: Journal of Zoological Systematics and Evolutionary Research. Band42, Nr.3. Blackwell Verlag, 2004, ISSN0947-5745, S.223–233, doi:10.1111/j.1439-0469.2004.00249.x (uni-heidelberg.de (Memento vom 2. April 2015 im Internet Archive) [PDF; 200kB]).
Z. T. Nagy, R. Lawson, U. Joger, M. Wink: Molecular systematics of racers, whipsnakes and relatives (Reptilia: Colubridae) using mitochondrial and nuclear markers. In: Journal of Zoological Systematics and Evolutionary Research. Band42, Nr.3. Blackwell Verlag, 2004, ISSN0947-5745, S.223–233, doi:10.1111/j.1439-0469.2004.00249.x (uni-heidelberg.de (Memento vom 2. April 2015 im Internet Archive) [PDF; 200kB]).
zdb-katalog.de
Beat Schätti, Urs Utiger: Hemerophis, a new genus for Zamenis socotrae Günther, and a contribution to the phylogeny of Old World racers, whip snakes, and related genera (Reptilia: Squamata: Colubrinae). In: Revue Suisse de Zoologie. Band108, 2001, ISSN0035-418X, S.919–948.
Z. T. Nagy, R. Lawson, U. Joger, M. Wink: Molecular systematics of racers, whipsnakes and relatives (Reptilia: Colubridae) using mitochondrial and nuclear markers. In: Journal of Zoological Systematics and Evolutionary Research. Band42, Nr.3. Blackwell Verlag, 2004, ISSN0947-5745, S.223–233, doi:10.1111/j.1439-0469.2004.00249.x (uni-heidelberg.de (Memento vom 2. April 2015 im Internet Archive) [PDF; 200kB]).