| Type | Title | Author | Publisher | Year |
| Article | On the complexity of the general coloring problem | Maurer, H.A., Sudborough, J.H., Welzl, E. | | 1981 |
| Article | On the complexity of the general coloring problem | Maurer, H.A., Sudborough, J.H., Welzl, E. | | 1981 |
| Article | On the connectedness of pictures in chain code pisture languages | Dassow, J. | | 1991 |
| Article | On the degree of non-regularity of context-free languages | Dassow, J., Paun, Gh. | | 1989 |
| Article | On the equivalence and containment problems for context-free languages | Hopcroft, J.E. | | 1969 |
| Article | On the equivalence and containment problems for unambiguous regular expressinos, regular grammars, and fintite automata | Stearns, R.E., Hunt, H.B. | | 1983 |
| Article | On the fidelity of some measures of syntactic complexity | Paun, Gh. | | 1987 |
| Article | On the fidelity of some measures of syntactic complexity | Paun, Gh. | | 1987 |
| Article | On the generative capacity of colonies | Paun, Gh. | | |
| Article | On the generative power of regular pattern grammars | Kleijn, H.C., Rozenberg, G. | | 1983 |
| Article | On the leftmost derivation in matrix grammars | Dassow, J., Fernau, H., Paun, Gh. | | |
| Article | On the ordered rooted trees used in theory of languages | Culik, K. | | |
| Article | On the possibility of mathematical revolutions | Kenney, E. | | |
| Article | On the power of Las Vegas II: Two-way finite automata | Hromkovic, J., Schnitger, G. | | 2000 |
| Article | On the power of colonies | Kelemenova, A., Csuhaj-Varju, E. | | |
| Article | On the power of communication structure for distributive generation of languages | Pardubska, D. | | 1993 |
| Article | On the power of cooperation: a regular representation of recursively enumerable languages | Csuhaj-Varju, E., Kelemen, J. | | 1991 |
| Article | On the power of periodic iteration of morhpisms | Lepisto, A. | | |
| Article | On the power of the splicing operation | Paun, Gh. | | |
| Article | On the regularity of wquality languages | Karhumaki, J. | | 1984 |
| Article | On the relation between ambiguity and nondeterminism in finite automata | Goldstine, J., Leung, H., Wotschke, D. | | 1992 |
| Article | On the role of configurations in the theory of grammars | Novotny, M. | | 1969 |
| Article | On the sequence equivalence problem for 0L systems with controlled derivations | Dassow, J. | | 1988 |
| Article | On the size of context-free grammars | Gruska, J. | | 1972 |
| Article | On the size of context-free grammars | Gruska, J. | | 1972 |
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