00445pamaa2200157 4500 0000016316 20090608090000.0 0201565331 004.65 SCH TK5105.5 SCH 1992 SCHAFER Systems network architecture Werner Schafer and Helmut an de Meulen. England: Addison Wesley, 1992. viii, 222p.: 24cm. Computer networks An de Meulen, Helmut