Demurtas, P., Perra, M., Maxia, C., Minerba, L., Zucca, I., Fossarello, M., Lai, S., Piras, F. and Sirigu, P. 2010. ACE I and ACE II: immunohistochemical study in primary pterygium. Italian Journal of Anatomy and Embryology. 115, 1/2 (Nov. 2010), 50.