Klaus R. Dittrich Hans Fritschi Stella Gatziu Andreas Geppert Anca Vaduva SAMOS in hindsight: experiences in building an active object-oriented DBMS. 369-392 2003 28 Inf. Syst. 5 http://dx.doi.org/10.1016/S0306-4379(02)00022-4 db/journals/is/is28.html#DittrichFGGV03