APA

Chik L., Spencer K., Johnson M. P., Ayoub M., Krivchenia E. L., Dombrowski M. P., Sokol R. J. & Evans M. I. (19971205). Precise gaussian distribution functions of maternal serum alpha-fetoprotein and free beta-subunit of human chorionic gonadotropin for trisomy 21 screening: improved accuracy for patient counseling. : American journal of obstetrics and gynecology.

Chicago

Chik L, Spencer K, Johnson M P, Ayoub M, Krivchenia E L, Dombrowski M P, Sokol R J and Evans M I. 19971205. Precise gaussian distribution functions of maternal serum alpha-fetoprotein and free beta-subunit of human chorionic gonadotropin for trisomy 21 screening: improved accuracy for patient counseling. : American journal of obstetrics and gynecology.

Harvard

Chik L., Spencer K., Johnson M. P., Ayoub M., Krivchenia E. L., Dombrowski M. P., Sokol R. J. and Evans M. I. (19971205). Precise gaussian distribution functions of maternal serum alpha-fetoprotein and free beta-subunit of human chorionic gonadotropin for trisomy 21 screening: improved accuracy for patient counseling. : American journal of obstetrics and gynecology.

MLA

Chik L, Spencer K, Johnson M P, Ayoub M, Krivchenia E L, Dombrowski M P, Sokol R J and Evans M I. Precise gaussian distribution functions of maternal serum alpha-fetoprotein and free beta-subunit of human chorionic gonadotropin for trisomy 21 screening: improved accuracy for patient counseling. : American journal of obstetrics and gynecology. 19971205.