共 12 条
[1]
AGRELL J, 1972, 15 MIL PSYK I RAPP
[4]
Cochran W.G., 2007, SAMPLING TECHNIQUES
[5]
DANIELSSON M, 1970, SOC MED TIDSKR, V47, P166
[7]
HAGLUND B, 1981, UNPUB HALSOPROFIL SK
[8]
JOSEPHSON E, 1978, LONGITUDINAL RES DRU, P137
[9]
LINDBERG S, 1977, 226 NARKOMANER
[10]
Siegel S., 1956, NONPARAMETRIC STAT B