00314nam a2200109Ia 4500008004100000022001700041040002500058082002000083100001900103245005800122260002400180240215s9999    xx            000 0 und d  a0-13-74984-7  aNORSU-DumcNORSU-Dum  a004.21/G87/1998  aGary Griffiths 4aThe Essence of Structured Systems Analysis Techniques  bPrentice Hallc1998