[1] M. Růžička: Some fundamental notions of large variable systems. Kybernetika 17 (1981), 5, 435-450.
[2] M. Růžička: 
Input-output systems, their types and applications for the automata theory. Kybernetika 18 (1982), 2, 131-144. 
MR 0679785 
[3] M. Růžička: 
Formalized models of ontological systems. Kybernetika 18 (1982), 6, 545 - 554. 
MR 0707400 
[4] R. Bek M. Růžička: 
On modelling of large variable systems of higher order by means of language systems. Kybernetika 15 (1979), 6, 408 - 418. 
MR 0562373