D. Helbig
发表
T. Park,
H. Zacur,
C. Westhoff,
2006,
Contraception.
T. Park,
H. Zacur,
C. Westhoff,
2006
.
S. C. Kaufman,
G. Gentile,
D. Helbig,
1998,
Fertility and sterility.
S. C. Kaufman,
H. Zacur,
G. Gentile,
1997,
Gynecological endocrinology : the official journal of the International Society of Gynecological Endocrinology.
J. Jaccard,
T. Gage,
D. Helbig,
1995
.
N. Smith,
D. Helbig,
D. O'Hare,
1972,
American journal of public health.
H. Zacur,
J Lee,
C Westhoff,
1996,
American journal of epidemiology.
J. Jaccard,
D. Helbig,
M. Gutman,
1996,
Health education quarterly.
J. Jaccard,
D. Helbig,
M. Gutman,
1990
.
Samuel B. Hopkins,
P. Harper,
D. Helbig,
1970,
Demography.
A. Blumstein,
G. Cassidy,
D. Helbig,
1972
.