G. F. Caldara, C. M. Vitale, O. Calderone, G. Lo Cascio, V. Ferrantelli, and M. Sarà, “Changes in eggshell ultrastructure of Falco naumanni and Tyto alba exposed to pesticides and polychlorinated biphenyls (PCBs)”, Ital J Anat Embryol, vol. 118, no. 2, p. 42, Jan. 2014.