Barber, MR (2001). "Immunolocalization of zona pellucida antigens in the ovarian follicle of dogs, cats, horses and elephants". Theriogenology. 55 (8): 1705–1717. doi:10.1016/s0093-691x(01)00514-3. PMID11393221.
Barber, MR (2001). "Immunolocalization of zona pellucida antigens in the ovarian follicle of dogs, cats, horses and elephants". Theriogenology. 55 (8): 1705–1717. doi:10.1016/s0093-691x(01)00514-3. PMID11393221.