共 30 条
- [21] Lilienfeld A. M., 1969, EPIDEMIOLOGY MONGOLI
- [22] Pearson P. L, 1974, CHROMOSOMAL ERRORS R, P219
- [23] Penrose L.S., 1966, DOWNS ANOMALY
- [24] Russell C S, 1966, J Obstet Gynaecol Br Commonw, V73, P742
- [25] SCHWARTZ D, 1972, REV EUR ETUD CL BIOL, V17, P867
- [26] STENCHEVER MA, 1967, OBSTET GYNECOL, V30, P683
- [28] Therkelsen A. J., 1974, CHROMOSOMAL ERRORS R, P81
- [29] WARBURTON D, 1964, AM J HUM GENET, V16, P1
- [30] WITSCHI E, 1970, EXC MED INT C SE 204, P157