00407nam a22001337a 4500008004100000040005500041080002000096100002200116245003400138260004300172300001000215650002100225653002700246230328b        |||||||| |||| 00| 0 eng d  aNational Science LibrarycNational Science Library  aD 681.324bN0.1  aNussbaumer, Henri  aComputer communication system  aNew York: bJohn Wiley & Sons,  c1987  a271p.  aComputer science  aInformation technology