Morphological variation in the lancehead pitviper Bothrops asper (Garman) (Serpentes: Viperidae) from Middle America
Sasa Mrin, Mahmoud
The University of Texas at Arlington ;ProQuest Dissertations & Theses;1996;1382262
https://www.proquest.com/openview/51e4b4c65f650935418d78824c4ad2fc/1?pq-origsite=gscholar&cbl=18750&diss=y