| Type | Title | Author | Publisher | Year |
| Article | On representing RE languages by one-sided interna contextual languages | Ehrenfeucht, A., Mateescu, A., Paun, Gh., Rozenberg, G., Salomaa, A. | | |
| Article | On representing RE languages by one-sided interna contextual languages | Ehrenfeucht, A., Mateescu, A., Paun, Gh., Rozenberg, G., Salomaa, A. | | 1995 |
| Article | On representing recursively enumerable languages by internal contextual langauges | Ehrenfeucht, A., Paun, G., Rozenberg, G. | | 1994 |
| Article | On scattered context grammars | Virkkunen, V. | | 1973 |
| Article | On semi-conditional grammars with productions having either forbidding or permitting conditions | Meduna, A., Gopalaratnam, A. | | 1994 |
| Article | On semi-conditional grammars with productions having either forbidding or permitting conditions | Meduna, A., Gopalaratnam, A. | | |
| Article | On semi-conditional grammars with productions having either forbidding or permitting conditions | Meduna, A., Gopalaratnam, A. | | 1994 |
| Article | On sets generated by context-free grammars | Gruska, J. | | 1966 |
| Article | On sets of numbers not recognisable by pushdown automata | Bird, R.S. | | 1968 |
| Article | On simple Goedel numberings and translations | Hartmanis, J., Baker, T.P. | | 1975 |
| Article | On some algebraic concepts of mathematical linguistics | Novotny, M. | | |
| Article | On some categories of sequential spaces | Slapal, J. | | 1996 |
| Article | On some context free languages that are not deterministic ET0L languages | Ehrenfeucht, A., Rozenberg, G. | | 1974 |
| Article | On some decidability problems for HD0L systems with nonsingular Parikh matrices | Ruohonen, K. | | 1979 |
| Article | On some extensions of indian parallel context free grammars | Dassow, J. | | 1980 |
| Article | On some extensions of russian parallel context free grammars | Dassow, J. | | 1984 |
| Article | On some families of formal languages obtained by regulated derivations | Salomaa, A. | | 1970 |
| Article | On some families of languages related to developmental systems | Culik Ii, K. | | 1973 |
| Article | On some operators reducing generalized grammars | Novotny, M. | | 1974 |
| Article | On some parameters occuring in certain effective constructions of grammars | Paun, Gh., Novotny, M. | | 1987 |
| Article | On some parameters occuring in certain effective constructions of grammars | Paun, Gh., Novotny, M. | | 1987 |
| Article | On some relations defined by languages | Novotny, M. | | |
| Article | On some structural properties of a subclass of inftinity-regular languages | Meznik, I. | | 1987 |
| Article | On some variants of random context grammars | Csuhaj-Varju, E., Paun, Gh. | | |
| Article | On sparse oracles separating feasible complexity classes | Hartmanis, J., Hemachandra, L. | | |
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