000 00319nam a2200121Ia 4500
008 231228s1990 xx 000 0 und d
041 _aeng
082 _a5.5
_bFRE
100 _aFREER (John R)
245 _aComputer Communications and Networks
260 _aNew Delhi
_bSigma Press New Delhi
_c1990
300 _ax, 431
999 _c1082893
_d1082893