共 13 条
[1]
AUGUSTIN A, UNPUB FACTORS ASS NO
[2]
COREIL J, 1989, INT J EPIDEMIOL, V18, P901
[3]
COREIL J, 1987, MATERNAL FACTORS USE
[5]
Goldman A., 1987, GROUP DEPTH INTERVIE
[6]
HEGGENHOUGEN K, 1987, EPC PUBLICATION, V7
[7]
KUMAR K, 1987, AID8 PROGR DES EV ME
[8]
Leslie J, 1987, TIME COSTS TIME SAVI
[9]
Morgan D. L., 1988, QUALITATIVE RES METH, V16