00286nam a2200109Ia 4500008004100000041000800041082001300049100001900062245004100081260004300122300001100165231228s1990    xx            000 0 und d  aeng  a5.5bFRE  aFREER (John R)  aComputer Communications and Networks  aNew DelhibSigma Press New Delhic1990  ax, 431