TY - BOOK AU - Worboys M ED - British National Conference on Databases( 11th : 1993 : Keele,UK ) ED - British National Conference on Databases 11th TI - Advanced databases systems : proceedings SN - 3-540-56921-9 U1 - 5.74 PY - 1993/// CY - Berlin PB - Springer Verlag KW - Database systems ER -