1. A hypertext model supporting query mechanisms;Afrati,1990
2. Universality of data retrieval languages;Aho,1979
3. System R: A relational approach to data management;Astrahan;ACM Trans. Database Syst.,1976
4. The object-oriented database system manifesto;Atkinson,1989
5. Magic sets and other strange ways to implement logic programs;Bancilhon,1986