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- [4] ELEMENTARY THEORIES OF RELATIVELY FREE SEMIGROUPS IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII MATEMATIKA, 1986, (02): : 41 - 43
- [7] ON ELEMENTARY THEORIES OF LOCALLY FREE UNIVERSAL ALGEBRAS DOKLADY AKADEMII NAUK SSSR, 1961, 138 (05): : 1009 - &