1. Waldeyer, W., in Eierstock und Ei. (Leipzig, 1870).
2. Kölliker, A. von, in Verhandlungen der anatomischen Gesellschaft. (Jena, 1898).
3. von Winiwarter, H., and Sainmont, G., Arch. biol., 24, 373–431 (1908).
4. Kingsbury, B. F., Am. J. Anat., 15, 345–387 (1913–14).
5. Byskov, A. G., and Rusmussen, G., in The Development and Maturation of the Ovary and its Functions (edit. by Peters, H.), Excerpta Medica International Congress Series, 267, 55–62 (1973).