000 00259nam a2200109Ia 4500
008 230411s9999 xx 000 0 und d
082 _a004.6
_bGUP
100 _a GUPTA (Prakash. C)
245 0 _aData Communications
260 _b PHI
_a New Delhi
942 _cBK
999 _c2810
_d2810