13 citations to https://www.mathnet.ru/eng/im1710
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S. I. Adian, “On the divisibility problem for one-relator monoids”, Math. Notes, 55:1 (1994), 3–7
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G. U. Oganesyan, “On semigroups with one relation and semigroups without cycles”, Math. USSR-Izv., 20:1 (1983), 89–95
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G. U. Oganesyan, “On the problems of equality and divisibility of words in a semigroup with a defining relation of the from”, Math. USSR-Izv., 12:3 (1978), 557–566