Indecomposable Cohen-Macaulay modules and irreducible maps
Compositio Mathematica, Tome 76 (1990) no. 1-2, pp. 277-294. 
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     author = {Popescu, Dorin and Roczen, Marko},
     title = {Indecomposable {Cohen-Macaulay} modules and irreducible maps},
     journal = {Compositio Mathematica},
     pages = {277--294},
     publisher = {Kluwer Academic Publishers},
     volume = {76},
     number = {1-2},
     year = {1990},
     mrnumber = {1078867},
     zbl = {0715.13010},
     language = {en},
     url = {http://www.numdam.org/item/CM_1990__76_1-2_277_0/}
}
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Popescu, Dorin; Roczen, Marko. Indecomposable Cohen-Macaulay modules and irreducible maps. Compositio Mathematica, Tome 76 (1990) no. 1-2, pp. 277-294. http://www.numdam.org/item/CM_1990__76_1-2_277_0/

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