Geodesic
Epimorphisms of Modules which must be Isomorphisms
Canadian mathematical bulletin, Tome 16 (1973) no. 4, pp. 513-515

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Let R be an associative ring (not necessarily with identity). R is a left П-ring if it has the following property: Let M be a finitely generated left R-module, N a submodule of M and φ:N→M an epimorphism. Then φ is an isomorphism. 
Djoković, D. Ž. Epimorphisms of Modules which must be Isomorphisms. Canadian mathematical bulletin, Tome 16 (1973) no. 4, pp. 513-515. doi: 10.4153/CMB-1973-083-0
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     title = {Epimorphisms of {Modules} which must be {Isomorphisms}},
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     year = {1973},
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     doi = {10.4153/CMB-1973-083-0},
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