D. Helbig

发表

T. Park, H. Zacur, C. Westhoff, 2006, Contraception.

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.

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.

Samuel B. Hopkins, P. Harper, D. Helbig, 1970, Demography.