000 00305nam a2200121Ia 4500
008 161121s9999 xx 000 0 und d
100 _aBECK ( LELAND . L)
245 0 _aSystem software : An introduction to sys
260 _cAddison - weley publ. company
365 _b0
650 _aNIL
942 _cBK
999 _c103355
_d103355