Beta-glucuronidase activity in mouse oocytes, mouse preimplantation embryos, and human gametes17, Lissens, W., Nijs M., Van der Linden M., Van Steirteghem A.C., and Liebaers I. , Prenat.Diagn., 0/8/1991, Volume 11, Issue 8, Number 512, p.509 - 512, (1991)