DRUG 543,088 Drug use during pregnancy and brest-feeding : a classification system for drug information / by Frederik Berglund [et al.] - Umea : /Publ. by the Scandinavian Association of Obstetric ians and Gyne cologists]. 1984 - 55 s. ; 25 cm Acta Obstexricia et Gynecologica Scandinavica, ISSN 0300-8835 ; suppl. 126 ISBN 91-7625-049-6