E de Teresa, A Vera, J Ortigosa, L A Pulpon, A P Arus, M de Artaza et al
de Teresa E, Vera A, Ortigosa J, Pulpon L A, Arus A P, de Artaza M et al.
Interaction between anticoagulants and contraceptives: an unsuspected finding.
Br Med J 1979; 2 :1260
doi:10.1136/bmj.2.6200.1260