Nowak, R. T.; Brodie, E. D. Rib Penetration and Associated Antipredator Adaptations in the Salamander Pleurodeles waltl (Salamandridae). Copeia. 1978, 1978 (3): 424–429. doi:10.2307/1443606.
Daltry Jennifer C.; Wuester Wolfgang; Thorpe Roger S. Diet and snake venom evolution. Nature. 1996, 379 (6565): 537–540. PMID 8596631. doi:10.1038/379537a0.