Lee H. Schilling, O. Thomas Bolding, C. Brandon Chenault, Augusto P. Chong, Fred Fleury, Katherine Forrest, Henry I. Glick, H.M. Hasson, Charles G. Heil, Robert S. London,
Evaluation of the clinical performance of three triphasic oral contraceptives: a multicenter, randomized comparative trial. American Journal of Obstetrics and Gynecology. ,vol. 160, pp. 1264- 1268 ,(1989) ,
10.1016/S0002-9378(89)80011-0