Bojkova, E. (1995) “An example of a finite number of recursively enumerable $m$-degrees containing an infinite sequence of recursively enumerable sets”, Ann. Sofia Univ. Fac. Math. and Inf, 87, pp. 223–234. Available at: https://stipendii.uni-sofia.bg/index.php/fmi/article/view/415 (Accessed: 25 November 2024).