550,442 NEW New perspectives on Streptococci and streptococcal infections ; Proceedings of the XI Lancefield International Symposium on Streptococci and Streptococcal Diseases Siena, September 10-14 1990 / ed. by G[raziella] Orefici. - Stuttgart [etc.] : Gustav Fischer Verl, 1992. - XIX, 569 s. . il., wykr. ; 24 cm (Zentralblatt für Bakteriologie, ISSN 0941-018X ; suppl.22) ISBN 3-437-11362-3 Stuttgart ISBN 1-56081-333-4 New York