1. Banakh, T.: Categorically closed topological groups. Axioms 6(3), 23 (2017).
https://doi.org/10.3390/axioms6030023
2. Banakh, T., Bardyla, S.: Completeness and absolute
$$H$$
H
-closedness of topological semilattices. Preprint
arxiv:1702.02791
3. Bardyla, S., Gutik, O.: On
$$\fancyscript {H}$$
H
-complete topological semilattices. Mat. Stud. 38(2), 118–123 (2012)
4. Chuchman, I., Gutik, O.: On H-closed topological semigroups and semilattices. Algebra Discrete Math. 1, 13–23 (2007)
5. Bardyla, S., Gutik, O., Ravsky, A.:
$$H$$
H
-closed topological groups. Topol. Appl. 217, 51–58 (2017)