000 00309nam a2200121Ia 4500
008 250409s9999 xx 000 0 und d
020 _a81-203-2846-4
082 _a4
_bGUP
100 _aGupta.Prakash
245 0 _aData communication and computer Networks
260 _aVidhyanagar
_bPHI
_c2011
365 _a450
999 _c258757
_d258757