Geodesic
A~sufficient condition for closed classes of $k$-valued logic to have only trivial congruences
Sbornik. Mathematics, Tome 38 (1981) no. 4, pp. 507-532

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In this paper the author obtains a classification of $M$-classes of closed classes of $k$-valued logic that are minimal (with respect to inclusion) relative to the property “all superclasses have only trivial congruences”, and an algorithm for constructing $M$-classes is proposed. On the basis of a description of $M$-classes, a sufficient condition is obtained for triviality of congruences of closed classes of $k$-valued logic. Bibliography: 11 titles. 
@article{SM_1981_38_4_a4,
     author = {V. V. Gorlov},
     title = {A~sufficient condition for closed classes of $k$-valued logic to have only trivial congruences},
     journal = {Sbornik. Mathematics},
     pages = {507--532},
     publisher = {mathdoc},
     volume = {38},
     number = {4},
     year = {1981},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1981_38_4_a4/}
}
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V. V. Gorlov. A~sufficient condition for closed classes of $k$-valued logic to have only trivial congruences. Sbornik. Mathematics, Tome 38 (1981) no. 4, pp. 507-532. http://geodesic.mathdoc.fr/item/SM_1981_38_4_a4/