000 00338nam a2200157Ia 4500
008 190201s9999 xx 000 0 und d
020 _a9.78E+12
082 _a5
082 _b756 CO
100 _a"Codd, E.F"
245 4 _aThe Relational Madel for
260 _aNew York
260 _bA.W.
260 _c1990
300 _a"xxii, 538"
999 _c32173
_d32173