Bilek, H., Wonglertnirant, N., Ngawhirunpat, T., Opanasopit, P. and Vollrath, M. K. .-. (2013) “Effect of Terpenes on the Skin Permeation of Ketoprofen through Shed Snake Skin”, Science, Engineering and Health Studies, 3(2), pp. 33–41. doi: 10.14456/sustj.2009.7.