VALAVANIS A. 312,268 INTERNATIONAL Xllth International Congress of Head and Neck Radio­ logy, XVII Congress of the European Society of Neu­ roradiology, 1st Congress of the World Federation of Interventional and Therapeutic Neuroradiology Octo­ ber 6-13 1991, Zurich, Switzerland /Congress Presi­ dent: A. Valavanis ; org. comm, chairman: A. Valava- nis [et al] ; Scientific Program Comm. - Chairmen G. du Boulay [et al]. - Berlin [etc]. : Springer-Veri., [1991]. - 263, [1] s. : il. ; 30 cm (Neuroradiology, ISSN 0028-3940 ; vol. 33, suppl.)