| Type | Title | Author | Publisher | Year |
| Article | On Invertible Cellular Automata | Culik II, K. | | 1987 |
| Article | On Multiple Grammars | Kral, J. | | 1969 |
| Article | On Ordered Variants of Some Regulated Grammars | Dassow, J., Paun, Gh. | | 1985 |
| Article | On Ordered Variants of Some Regulated Grammars | Dassow, J., Paun, Gh. | | 1985 |
| Article | On Pebble Automata | Chang, J.H., Ibarra, O.H., Palis, M.A. | | 1986 |
| Article | On Predecessors of Finite Languages | Maurer, H.A., Salomaa, A., Wood, D. | | 1981 |
| Article | On Problems (Semantic Study) | Materna, P. | | 1970 |
| Article | On Pure Multi-Pushdown Automata that Perform Complete Pushdown Pops | Masopust, T., Meduna, A. | | 2009 |
| Article | On Quasi-Interpretations of Grammar Forms | Ginsburg, S., Maurer, H.A. | | 1977 |
| Article | On Regulated L Systems | Dassow, J. | | 1984 |
| Article | On Some Closure Properties of Generable Languages | Meznik, I. | | 1973 |
| Article | On Some Special Classes of Regular Languages | Imreh, B., Ito, M. | | |
| Article | On States Observability in Deterministic Finite Automata | Mateescu, A., Paun, Gh. | | 1987 |
| Article | On Strict Interpretations of Grammar Forms | Ginsburg, S., Leong, B., Mayer, O., Wotschke, D. | | 1979 |
| Article | On Strongly Equivalent Context-Free Grammar Forms | Ginsburg, S., Maurer, H.A. | | 1976 |
| Article | On Sub Regular 0L Forms | Albert, J., Maurer, H.A., Ottmann, Th. | | 1981 |
| Article | On Superreducts | Novotny, M., Pawlak, Z. | | 1990 |
| Article | On Thinness and Slenderness of L Languages | Dassow, J., Paun, Gh., Salomaa, A. | | 1993 |
| Article | On a Family of L Languages Resulting from Systolic Tree Automata | Culik II, K., Gruska, J., Salomaa, A. | | 1983 |
| Article | On a Modification of Axioms of General Relations | Karasek, J. | | 1999 |
| Article | On a class of infinite words with bounded repetitions | Cerny, A. | | 1985 |
| Article | On a class of languages | Novotny, M. | | 1969 |
| Article | On a classification of context-free languages | Gruska, J. | | 1967 |
| Article | On a classification of context-free languages | Gruska, J. | | 1967 |
| Article | On a completion method for unimodular matrices | Bik, A.J.C., Wiijshoff, H.A.G. | | 1994 |
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