共 7 条
[1]
ANDERSON O, 1957, VOLUNTARY HLTH INSUR
[2]
Anderson OW, 1956, FAMILY MED COSTS VOL
[3]
BUELL B, 1958, MENTAL HYGIENE, V42
[4]
GREENWOOD, 1913, BIOMETRIKA, P28
[5]
HINKLE LE, 1956, AM J HYGIENE, V64
[6]
HINKLE LE, 1952, IND MED SURGERY, V21, P8
[7]
1958, AM J PUBLIC HL 2 NOV