[1] A. Blikle A. Mazurkiewicz: An Algebraic Approach to the Theory of Programs, Algorithms, Languages and Recursiveness. Proc. Symp. on Math. Foundю of Computer Sci., Jablonna 1972.
[2] K. Čulík: On Sequential and Non-Sequential Machines and their Relation to the Computation in Computers. Mimeographed in IFIP WG 2.2 Bulletin, No. 6, February 1970.
[3] K. Čulík M. A. Arbib: 
Sequential and Jumping Machines and their Relation to Computers. Acta Informatica 2 (1973), 162-171. 
MR 0329789[4] K. Čulík: 
Algorithmic Algebras of Computers. Czechoslovak Math. Journal 23 (1973), 670-689. 
MR 0356562[5] K. Čulík: Some Notes on Logical Analysis of Programming Languages. Teorie a metoda 3 (1971), 101-111.
[7] J. Mareš: Programmed Automata. (In Czech.) CSc. - thesis, Prague 1973 (not published).
[8] R. Milner: 
Equivalences on Program Schemes. Jour. Comp. and Syst. Sciences 4 (1970), 205-219. 
MR 0276097 | 
Zbl 0209.18705[9] Z. Pawlak: 
Stored Program Computers. (In Polish.) Algorytmy Vol. 5, No.  10 (1969), 5-19. 
MR 0255104[10] H. Rossner: 
Formalization of the Notion of the Program. (In Polish.) Algorytmy Vol. 5, No. 10 (1969), 25-43. 
MR 0255106