000 00272nam a2200121Ia 4500
008 221102s9999 xx 000 0 und d
082 _a658 HBR
100 _aHBR
245 4 _aThe information infrastructure
260 _bHBR
_aUSA
_c1991
300 _a117p p.
942 _cBK
999 _c1089
_d1089