550,274 SCIENCE Science challenging AIDS : Proceedings Based on the Vllth International Conference on AIDS, Florence, June 16-21, 1991 / managing ed. Gaetano Giraldo ; vol. eds, Giovanni Battista [et al]. - Basel [etc.] : Karger, 1992. - XVIII, 300 s. : il., wykr. ; 25 cm ISBN 3-8055-5485-0