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| quote: | Originally posted by Lagrangian
Borisov, V. V. (1969), "Simple examples of groups with unsolvable word problem", Akademiya Nauk SSSR. Matematicheskie Zametki 6: 521–532, |
You bother posting a reference to an article published by the Soviet Academy of Science and you forget to post a link?
What kind of spambot are you!? 
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