1.
Downey R, Greenberg N, Hammatt E. A Hierarchy of Computably Enumerable Degrees II: Some Recent Developments and New Directions. NZ J Math [Internet]. 2021 Sep. 19 [cited 2024 Apr. 25];52:175-231. Available from: https://nzjmath.org/index.php/NZJMATH/article/view/133