Reference

Steven D. Werman (1999): Molecular Phylogenetics and Morphological Evolution in Neotropical Pitvipers: an Evaluation or Mitochondrial DNA Sequence Information and the Comparative Morphology of the Cranium and Palatomaxillary Arch – Kaupia - Darmstädter Beiträge zur Naturgeschichte – 8: 119 - 126.