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Module Theory: Endomorphism rings and direct sum decompositions in some classes of modules (Modern Birkhäuser Classics): Facchini, Alberto: 9783034803021: Amazon.com: Books
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Lecture 14 Rings and Modules | Internal direct sum in Rings | use of residue classes in Internal sum - YouTube
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Module Theory: Endomorphism Rings and Direct Sum Decompositions in Some Classes of Modules (Progress in Mathematics #167) (Hardcover) | Wild Rumpus
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