Transitively acting monoids of local automorphisms of locally finite trees Jan Chvalina; Ludmila Chvalinová — 1983 Archivum Mathematicum
State hypergroups of automata Jan Chvalina; Ludmila Chvalinová — 1996 Acta Mathematica et Informatica Universitatis Ostraviensis
Multistructures determined by differential rings Jan Chvalina; Ludmila Chvalinová — 2000 Archivum Mathematicum