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- [28] RINGS IN WHICH EVERY LEFT IDEAL IS QUASI-PROJECTIVE NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1973, 20 (02): : A260 - A260
- [29] RINGS FOR WHICH EVERY CYCLIC MODULE IS QUASI-PROJECTIVE NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1970, 17 (02): : 425 - &