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Ring extensions, injective covers and envelopes |
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| Authors: | D. Dempsey L. Oyonarte Y.-M. Song |
| Affiliation: | Department of Mathematics, University of Kentucky, Lexington, KY 40506-0027, U.S.A., US Dept. álgebra y Análisis Matemático, Universidad de Almería, 04120 Almería, Spain, ES Department of Mathematics Education, Sunchon National University, Sunchon 540-742, Korea, KR |
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