共 54 条
[2]
[Anonymous], 1994, SURV RES METHODS-GER
[4]
Becker HS., 1963, OUTSIDERS, Vvol. 1973
[6]
Biernacki P., 1986, PATHWAYS HEROIN ADDI
[7]
BIERNACKI P, 1986, 15TH INT I PREV TREA
[8]
CAMPBELL DT, 1963, EXPT QUASI-EXPT DESI
[9]
AIDS SEROLOGY TESTING IN LOW-RISK AND HIGH-RISK GROUPS
[J].
JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION,
1985, 253 (23)
:3405-3408
[10]
CARLSON JR, 1988, JAMA-J AM MED ASSOC, V260, P674