Geodesic
Truth tabular degrees of recursively enumerable sets
Matematičeskie zametki, Tome 14 (1973) no. 5, pp. 697-702.

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The upper semilattice of truth tabular degrees of recursively enumerable (r.e.) sets is studied. It is shown that there exists an infinite set of pairwise tabularly incomparable truth tabular degrees higher than any tabularly incomplete r.e. truth tabular degree. A similar assertion holds also for r.e. $m$-degrees. Hence follows that a complete truth tabular degree contains an infinite antichain of r.e. $m$-degrees. 
@article{MZM_1973_14_5_a9,
     author = {S. Kallibekov},
     title = {Truth tabular degrees of recursively enumerable sets},
     journal = {Matemati\v{c}eskie zametki},
     pages = {697--702},
     publisher = {mathdoc},
     volume = {14},
     number = {5},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1973_14_5_a9/}
}
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S. Kallibekov. Truth tabular degrees of recursively enumerable sets. Matematičeskie zametki, Tome 14 (1973) no. 5, pp. 697-702. http://geodesic.mathdoc.fr/item/MZM_1973_14_5_a9/