000 00286nam a2200121Ia 4500
008 190107s9999 xx 000 0 und d
020 _a9788121904766
100 _a"Singh, Ashok"
245 0 _aPrinciples of communication engineering
260 _bS.Chand
365 _b325/-
942 _cBK
999 _c644
_d644