On two problems related to cancellativity.
Semigroup forum, Tome 33 (1986), pp. 331-356.

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Mots-clés : decision problems, right-cancellativity, left-cancellativity, finite Church-Rosser Thue systems, finite presentations
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     author = {F. Otto},
     title = {On two problems related to cancellativity.},
     journal = {Semigroup forum},
     pages = {331--356},
     publisher = {mathdoc},
     volume = {33},
     year = {1986},
     zbl = {0584.20046},
     url = {http://geodesic.mathdoc.fr/item/SF_1986__33_134818/}
}
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F. Otto. On two problems related to cancellativity.. Semigroup forum, Tome 33 (1986), pp. 331-356. http://geodesic.mathdoc.fr/item/SF_1986__33_134818/