00291nam a2200109Ia 4500008004100000082001600041100002100057245002900078260003500107300001700142650002200159240817s9999    xx            000 0 und d  a001.6 K84,d  aKorth , Henry F. 0aDatabase System Concepts  c1991a Newyorkb McGraw - Hill  axix , 694 p.  a Computer Science