Simple examples of unsolvable associative calculi
Yu. V. Matiyasevich

This publication is cited in the following articles:

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2. V. G. Durnev, O. V. Zetkina, A. I. Zetkina, “O «prostykh» algoritmicheski nerazreshimykh fragmentakh elementarnoi teorii beskonechno porozhdennoi svobodnoi polugruppy”, Chebyshevskii sb., 21:4 (2020), 56–71    
3. S. I. Adian, “On the studies of Gennadii Semënovich Makanin on algorithmic questions of the theory of groups and semigroups”, Russian Math. Surveys, 73:3 (2018), 553–568                
4. S. I. Adian, V. G. Durnev, “Decision problems for groups and semigroups”, Russian Math. Surveys, 55:2 (2000), 207–296