Terence R. Smith Jianwen Su Amr El Abbadi Divyakant Agrawal Gustavo Alonso Amitabh Saran Computational modeling systems. 127-153 1995 20 Inf. Syst. 2 db/journals/is/is20.html#SmithSAAAS95 http://dx.doi.org/10.1016/0306-4379(95)98558-U