Geodesic
On the congruence of the upper semilattices of recursively enumerable $m$-powers and tabular powers
Matematičeskie zametki, Tome 20 (1976) no. 1, pp. 19-26.

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We have proved that in the upper semilattice of recursively enumerable tabular powers the set of minimal powers has an upper bound differing from the total power. 
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     title = {On the congruence of the upper semilattices of recursively enumerable $m$-powers and tabular powers},
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S. S. Marchenkov. On the congruence of the upper semilattices of recursively enumerable $m$-powers and tabular powers. Matematičeskie zametki, Tome 20 (1976) no. 1, pp. 19-26. http://geodesic.mathdoc.fr/item/MZM_1976_20_1_a2/