00250nam a2200109Ia 4500008004100000041001200041082001100053100002000064245004400084260000600128650000600134221030s9999    xx            000 0 und d  aEnglish  a105.23  aD. R. Choudhury 0aNetwork and Systemscby D. R. Choudhury  c0  aB