Membership Problems for Data Dependencies in Relational Expressions. - Minoru Ito; Motoaki Iwasaki; Kenichi Taniguchi; Tadao Kasami (Theor. Comput. Sci., 1984)

Some Results on the Representative Instance in Relational Databases. - Minoru Ito; Motoaki Iwasaki; Tadao Kasami (SIAM J. Comput., 1985)