Geodesic
The~invariants of Post classes
Fundamentalʹnaâ i prikladnaâ matematika, Tome 4 (1998) no. 4, pp. 1385-1404.

Voir la notice de l'article provenant de la source Math-Net.Ru

For every Post class containing the identical function the set of all its invariats (the relations which are preserved by all functions of the class) is described. 
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     author = {S. S. Marchenkov},
     title = {The~invariants of {Post} classes},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
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     publisher = {mathdoc},
     volume = {4},
     number = {4},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_1998_4_4_a14/}
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S. S. Marchenkov. The~invariants of Post classes. Fundamentalʹnaâ i prikladnaâ matematika, Tome 4 (1998) no. 4, pp. 1385-1404. http://geodesic.mathdoc.fr/item/FPM_1998_4_4_a14/