1. An ultrastructural study of primordial germ cells, oogonia and early oocytes in Xenopus laevis;Al-Mukhtar;J. Embryol. Exp. Morphol.,1971
2. Sur la constitution du germe dans l'oeuf animal avant la fecondation;Balbiani;CR. Hebd Seances Acad. Sci.,1864
3. Changes in the ultrastructure of amphibian eggs following fertilization;Balinsky;Acta Embryol. Morphol. Exp.,1966
4. The structure of the mitochondrial cloud of Xenopus laevis oocytes;Billet;J. Embryol. Exp. Morphol.,1976
5. Contribution to the study of germ cell in Anura;Blackler;J. Embryol. Exp. Morphol.,1958