APA

Christodoulou C. N., Zonas C., Loukaides T., Maniatis A., Giannikos L., Giannakopoulos C. & Fassoula M. (19950810). Low beta-hCG is associated with poor prognosis in association with an embryo with positive cardiac activity. : Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology.

Chicago

Christodoulou C N, Zonas C, Loukaides T, Maniatis A, Giannikos L, Giannakopoulos C and Fassoula M. 19950810. Low beta-hCG is associated with poor prognosis in association with an embryo with positive cardiac activity. : Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology.

Harvard

Christodoulou C. N., Zonas C., Loukaides T., Maniatis A., Giannikos L., Giannakopoulos C. and Fassoula M. (19950810). Low beta-hCG is associated with poor prognosis in association with an embryo with positive cardiac activity. : Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology.

MLA

Christodoulou C N, Zonas C, Loukaides T, Maniatis A, Giannikos L, Giannakopoulos C and Fassoula M. Low beta-hCG is associated with poor prognosis in association with an embryo with positive cardiac activity. : Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology. 19950810.