Krochmal AR, Bakken GS, LaDuc TJ. 2004. Heat in evolution's kitchen: evolutionary perspectives on the functions and origin of the facial pit of pitvipers (Viperidae: Crotalinae). J. Exp. Biol. 207(24): 4231–8. Text (页面存档备份,存于互联网档案馆) at the Journal of Experimental Biology (页面存档备份,存于互联网档案馆)
Safer AB, Grace MS. 2004. Infrared imaging in vipers: differential responses of crotaline and viperine snakes to paired thermal targets. Behav. Brain Res. 154(1): 55–61. Summary (页面存档备份,存于互联网档案馆) at NCBI (页面存档备份,存于互联网档案馆)
Krochmal AR, Bakken GS, LaDuc TJ. 2004. Heat in evolution's kitchen: evolutionary perspectives on the functions and origin of the facial pit of pitvipers (Viperidae: Crotalinae). J. Exp. Biol. 207(24): 4231–8. Text (页面存档备份,存于互联网档案馆) at the Journal of Experimental Biology (页面存档备份,存于互联网档案馆)