00365nam a2200121Ia 450000500170000000800410001702000220005805000230008010000240010324500530012726000340018065000290021420251229182151.0251229s9999    xx            000 0 und d  a978-0-02-415431-6  aHF 5548.2.S73 1990  aStallings, Williams 0aBusiness data communicationscWilliams Stallings  aLondon Collier macmillan 1990  aBusiness-Data Processing