000 00290nam a2200121Ia 4500
008 241013s9999 xx 000 0 und d
020 _a9788131761755
100 _aStallings,William
245 0 _aNetwork Security Essentials
260 _bAddison-Wesley
_c1994
300 _a606
942 _cBK
999 _c9787
_d9787