Steinfeld Ottó: Quasi-ideals in rings and semigroups - Disquisitiones mathematicae Hungaricae 10. (Budapest, 1978)
QUASI-I DEALS IN RINGS AND SEMIGROUPS 1828-1978 PUBLISHED IN THE YEAR OF THE 150th JUBILEE
QUASI-I DEALS IN RINGS AND SEMIGROUPS 1828-1978 PUBLISHED IN THE YEAR OF THE 150th JUBILEE