2Kalu DN. The aged rat model od ovarian hormone deficiency done loss [J] . Endocrinology, 1989,124: 7-9.
3Gray TK,Monan S,Linkhart TA. Ertradiol stimulates in vitro the secretion of insulin-like growth factors by the clonal osteoblastic cell line UMR 106 [J]. Biochem Biophys Res Commum, 1989,158: 407-410.
4Nishimara I, Damiani PJ,Atwood DA. Resorption of residral ridge in rats [J]. J Dent Res,1987,66(12):1753-1758.