00306nam a2200121Ia 4500008004100000041001200041082001100053100001600064245007600080260000600156650000600162700001600168221030s9999    xx            000 0 und d  aEnglish  a105.23  aR. P. Singh 0aCommunication Systems - Analog and Digitalcby R. P. Singh, S. D. Sapre  c0  aB  aS. D. Sapre