00281nam a2200109Ia 4500008004100000041001200041100001600053245007400069260000600143650000600149700001600155221030s9999    xx            000 0 und d  aEnglish  aR. P. Singh 0aCommunication Systems Analog and Digitalcby R. P. Singh, S. D. Sapre  c0  aB  aS. D. Sapre