B Astedt, L Svanberg, S Jeppsson, P Liedholm, G Rannevik
Astedt B, Svanberg L, Jeppsson S, Liedholm P, Rannevik G.
The natural oestrogenic hormone oestradiol as a new component of combined oral contraceptives.
Br Med J 1977; 1 :269
doi:10.1136/bmj.1.6056.269