000 00294nam a2200121Ia 4500
008 200810s9999 xx 000 0 und d
082 _a004.65
100 _aSharma,K.K.
245 0 _aElements of data communication
260 _aNew Delhi
_bS.K.Kataria
_c2011
300 _a393 p.
942 _cREF
999 _c34466
_d34466