000 00320nam a2200133Ia 4500
008 181001s1998 xx 000 0 und d
082 _a004.6
_bGUP
100 _aGupta, P. C.
245 0 _aData communications
260 _bPHI,
_aNew Delhi:
_c©1998
300 _a475p.
650 _aInformation Technology
942 _2ddc
_cBK
999 _c97
_d97