Geodesic
Undecidable algorithmic problems for semigroups, groups and rings
Itogi Nauki i Tekhniki. Seriya Algebra. Geometriya. Topologiya, Itogi Nauki i Tekhniki. Seriya "Algebra. Topologiya. Geometriya", Tome 25 (1987), pp. 3-66 
L. A. Bokut'; G. P. Kykin. Undecidable algorithmic problems for semigroups, groups and rings. Itogi Nauki i Tekhniki. Seriya Algebra. Geometriya. Topologiya, Itogi Nauki i Tekhniki. Seriya "Algebra. Topologiya. Geometriya", Tome 25 (1987), pp. 3-66. http://geodesic.mathdoc.fr/item/INTA_1987_25_a0/
@article{INTA_1987_25_a0,
     author = {L. A. Bokut' and G. P. Kykin},
     title = {Undecidable algorithmic problems for semigroups, groups and rings},
     journal = {Itogi Nauki i Tekhniki. Seriya Algebra. Geometriya. Topologiya},
     pages = {3--66},
     year = {1987},
     volume = {25},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTA_1987_25_a0/}
}
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%D 1987
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