305,794 CONGRESS The 7th Congress of World Federation for Ultrasound in Medicine and Biology. The 4th Congress of World Federation of Sonographers Sapporo, Hokkaido, Japan July 17-22, 1994 : program and abstracts. - [Hew York] s Pergamon, 1994. - X, 275, XXVIII s. : il. ; 28 cm (Ultrasound Medicine and Biology, ISSN 0301-5629 ; vol. 20 suppl. 1)