Smith LD, Ecker RE (June 1971). "The interaction of steroids with Rana pipiens Oocytes in the induction of maturation". Developmental Biology. 25 (2): 232–47. doi:10.1016/0012-1606(71)90029-7. PMID5562852.
Smith LD, Ecker RE (June 1971). "The interaction of steroids with Rana pipiens Oocytes in the induction of maturation". Developmental Biology. 25 (2): 232–47. doi:10.1016/0012-1606(71)90029-7. PMID5562852.