Geodesic
Simple examples of groups with unsolvable word problem
Matematičeskie zametki, Tome 6 (1969) no. 5, pp. 521-532 Cet article a éte moissonné depuis la source Math-Net.Ru

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An example is constructed of a finitely defined group given by 12 governing relations, in which the word problem is unsolvable. 
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     author = {V. V. Borisov},
     title = {Simple examples of groups with unsolvable word problem},
     journal = {Matemati\v{c}eskie zametki},
     pages = {521--532},
     year = {1969},
     volume = {6},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1969_6_5_a1/}
}
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V. V. Borisov. Simple examples of groups with unsolvable word problem. Matematičeskie zametki, Tome 6 (1969) no. 5, pp. 521-532. http://geodesic.mathdoc.fr/item/MZM_1969_6_5_a1/