- I. I. Batyrshin, “Q-reducibility and m-reducibility on computably enumerable sets”, Sib Math J, 55, no. 6, 2014,
995 
- I. I. Batyrshin, “Irreducible, Singular, and Contiguous Degrees”, Algebra Logic, 56, no. 3, 2017,
181 - Roland Sh Omanadze, “Some structural properties of quasi-degrees”, Logic Journal of the IGPL, 26, no. 1, 2018,
191