SOME RESULTS ON THE UPPER-SEMILATTICE OF R.E. $m$-DEGREES INSIDE A SINGLE R.E. $tt$-DEGREE. Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, [S. l.], v. 96, p. 23–34, 2004. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/158. Acesso em: 11 jan. 2026.