Publisher
Springer Berlin Heidelberg
Reference12 articles.
1. Denisov, S.D.: Structure of the upper semilattice of recursively enumerable m-degrees and related questions. I. Algebra and Logic 17, 418–443 (1978)
2. Ershov, Y.L.: Hyperhypersimple m-degrees. Algebra i Logika 8, 523–552 [in Russian] (1969)
3. Ershov, Y.L.: The upper semilattice of numerations of a finite set. Algebra and Logic 14, 159–175 (1975)
4. Ershov, Y.L.: Numbering theory. Nauka, Moskow [in Russian] (1977)
5. Grätzer, G.: Generall lattice theory. Birkhäuser Verlag, Basel (1998)