共 5 条
[1]
BECKMANN SIEGFRIED, 1931, ARCH GYNAKOL, V145, P194, DOI 10.1007/BF01809994
[3]
DOMINGUEZ R, UNPUB
[4]
FISHER RA, 1957, STATISTICAL TABLES B
[5]
WALKER J, 1954, J OBSTET GYN BRIT EM, V61, P162