000 00335nam a2200133Ia 4500
001 122585
008 170722s9999 xx 000 0 und d
020 _a8185336334
100 _aFreer, John R.
245 _aComputer communications and networks /
260 _aNew Delhi :
_bEWP ,
_c1990.
300 _aPpx+432
_c24cms
942 _cGEN
999 _c119479
_d119479