New systems and services in telecommunications, II : proceedings of the Second International Conference on New Systems and Services in Telecommunications, Liege, Belgium, November 16-18, 1983 - Cantraine, G. (Guy), 1934-; Destine, J. (Jacques), 1949- (North-Holland ; Sole distributors for the U.S.A. and Canada, Elsevier Science Pub. Co., 1984)