Set transformations with centralizers formed by closed deformations of quasi-discrete topological spaces Chvalina, J. — 1977 General topology and its relations to modern analysis and algebra IV
Realizations of closure spaces by set systems Chvalina, J.; Sekanina, M. — 1972 General Topology and its Relations to Modern Analysis and Algebra
On parametrizable topological general systems with neighbourhood input and output spaces J. Chvalina — 1985 Matematički Vesnik
Characterizations of certain general and reproductive solutions of arbitrary equations J. Chvalina — 1987 Matematički Vesnik