V. V. Višin. Toždéstvénnyé préobrazovaniá v čétyréhznačnoj logiké. Doklady Akadémii Nauk SSSR, vol. 150 (1963), pp. 719–721. - V. V. Višin. Identical transformations in four-place logic. English translation of the preceding by J. N. Whitney. Soviet mathematics, vol. 4 no. 3 (1963), pp. 724–726. - V. L. Murskij. Suščéstvovanié v tréhznačnoj logiké zamknutogo klassa s konéčnym bazisom, ne iméúščégo konéčnoj polnoj sistémy toždéstv. Doklady Akadémii Nauk SSSR, vol. 163 (1965), pp. 815–818. - V. L. Murskiǐ. The existence in three-valued logic of a closed class with finite basis, not having a finite complete system of identities. English translation of the preceding by Elliott Mendelson. Soviet mathematics, vol. 6 (1965), pp. 1020–1024.
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