1. Abel, M. Generalisation of Segal algebras for arbitrary topological algebras. Period. Math. Hung., 2018, 77(1), 58–68.
https://doi.org/10.1007/s10998-017-0222-z

2. Abel, M. Initial, terminal and zero objects in the category S (B) of Segal topological algebras. Proceedings of the ICTAA 2018; Math. Stud. (Tartu), 2018, 7, 7–24.

3. Abel, M. About products in the category S (B) of Segal topological algebras. Proceedings of the ICTAA 2018; Math. Stud. (Tartu), 2018, 7, 25–32.

4. Abel, M. About some categories of Segal topological algebras. Poincare J. Anal. Appl., 2019, 1, 1–14.
https://doi.org/10.46753/pjaa.2019.v06i01.001

5. Abel, M. Products and coproducts in the category S (B) of Segal topological algebras. Proc. Estonian Acad. Sci., 2019, 68(1), 88–99.
https://doi.org/10.3176/proc.2019.1.09

6. Abel, M. About pushouts in the category S (B) of Segal topological algebras. Proc. Estonian Acad. Sci., 2019, 68(3), 319–323. 
https://doi.org/10.3176/proc.2019.3.08

7. Abel, M. About the limits of inverse systems in the category S (B) of Segal topological algebras. Proc. Estonian Acad. Sci., 2020, 69(1), 1–10.
https://doi.org/10.3176/proc.2020.1.01

8. Abel, M. About the cocompleteness of the category S (B) of Segal topological algebras. Proc. Estonian Acad. Sci., 2020, 69(1), 53–56.
https://doi.org/10.3176/proc.2020.1.06

9. Abel, M. Coproducts in the category S (B) of Segal topological algebras, revisited. Period. Math. Hung., 2020, 81(2), 201–216. 
https://doi.org/10.1007/s10998-020-00328-z

10. Abel, M. Initial objects, terminal objects, zero objects and equalizers in the category Seg of Segal topological algebras. Proc. Estonian Acad. Sci., 2020, 69(4), 361–367.
https://doi.org/10.3176/proc.2020.4.10

11. Mac Lane, S. Categories for the Working Mathematician. Graduate Texts in Mathematics, Vol. 5. Springer, New York, NY, 1971. 
https://doi.org/10.1007/978-1-4612-9839-7