TY - JOUR AU - Weinert, H.J. AU - Dixit, V.N. AU - Singhal, P.K. TI - On quasi-ideals in contracted semigroups rings. JO - Semigroup forum PY - 1986 VL - 33 SP - 431 EP - 440 KW - contracted semigroup ring; formal quasi-ideals; minimal quasi-ideal UR - http://eudml.org/doc/134823 ER -