551,213 ANDERSSON KERSTIN Intrauterine release of levonorgestrel :a contraceptive and therapeutical system : [akademisk avhand-ling] / by Kerstin Andersson ;from the Department of Obstetrics and Gynecology, University of Göteborg, Sweden. - Göteborg: University, 1993. - 107 s. wiele liczb.:il., wykr. ; 25 cm Zawiera 5 prac współaut. ISBN 91-628-0839-7