共 12 条
[4]
Fowler Jr F. J., 1984, SURVEY RES METHODS
[5]
GOLDBERG RE, 1988, UNPUB CONGRUENCE PAT
[6]
GOODMAN L, 1981, 3RD P BIENN C HLTH S, P56
[8]
HARKINS E, 1981, 3RD P BIENN C HLTH S, P38
[9]
LOFT J, 1981, 3RD P BIENN C HLTH S, P68
[10]
Masterson-Allen S, 1987, R I Med J, V70, P217