A NEW CLASS OF LONG-ACTING HORMONAL STEROID PREPARATION: SYNTHESIS OF DIMERIC ETHYNODIOL AND NORTESTOSTERONE, OF DIMERIC AND TRIMERIC ANDROGENS AND OF SOME DIMERIC COMBINATIONS OF STEROIDS = UNE NOUVELLE CATEGORIE DE PREPARATIONS DE STEROIDES HORMONAUX A ACTION PROLONGEE: SYNTHESE DU DIMERE ETHYNODIOL ET NORTESTOSTERONE, DES ANDROGENES DIMERES ET TRIMERES ET DE QUELQUES ASSOCIATIONS DIMERES DE STEROIDESKUHL H; TAUBERT HD.1974; STEROIDS; U.S.A.; DA. 1974; VOL. 24; NO 5; PP. 613-626; BIBL. 5 REF.Article