000 00244nam a2200109Ia 4500
020 _a978-0070151529
082 _a621.382
100 _aSINGH, R.P and SAPRE, S D
245 _aCOMMUNICATION SYSTEMS:ANALOG &DIGITAL
260 _c2005
942 _cBK
999 _c1060
_d1060