É. I. Grindlingér. O nérazréšimosti problémy toždéstva slov dlá odnogo klassa polugrupp s razréšimoj problèmoj izomorfizma. Doklady Akadémii Nauk SSSR, vol. 171 (1966), pp. 519–520. - E. I. Grindlinger [Greendlinger]. On the unsolvability of the word problem for a class of semigroups with a solvable isomorphism problem. English translation of the preceding by M. Greendlinger. Soviet mathematics, vol. 7 no. 6 (1967), pp. 1502–1503.
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