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- [3] NOTE ON GRADED VONNEUMANN REGULAR-RINGS REVUE ROUMAINE DE MATHEMATIQUES PURES ET APPLIQUEES, 1984, 29 (03): : 263 - 271
- [10] RINGS GRADED BY AN INVERSE SEMIGROUP WITH FINITELY MANY IDEMPOTENTS HOUSTON JOURNAL OF MATHEMATICS, 1989, 15 (02): : 291 - 304