TY  - JOUR
A1  - Hornsby, P.P.
A1  - Wilcox, A.J.
T1  - Validity of questionnaire information on frequency of coitus
Y1  - 1989
JF  - American Journal of Epidemiology
VL  - 130
IS  - 1
SP  - 94
EP  - -99

ER  -