| Type | Title | Author | Publisher | Year |
| Article | On state grammars | Meduna, A., Horbath, Gy. | | 1988 |
| Article | On state grammars | Meduna, A., Horbath, Gy. | | 1988 |
| Article | On state grammars | Meduna, A., Horvath, Gy. | | 1988 |
| Article | On stop-conditions in the definitions of constructive languages | Fris, I. | | 1965 |
| Article | On structural unambiguity of formal languages | Gruska, J. | | 1965 |
| Article | On structured graph grammars: I | Kreowski, H.-J., Rozenberg, G. | | 1990 |
| Article | On structured graph grammars: II | Kreowski, H.-J., Rozenberg, G. | | 1990 |
| Article | On the Approximation of Steiner Minimal Trees in Graphs | Widmayer, P., Wu, Y.F., Wong, C.K. | | 1985 |
| Article | On the Characterization of Certain Classes of Developmental Languages by Automata | von Solms, S.H. | | 1975 |
| Article | On the Circular Closure of Languages | Dassow, J. | | 1979 |
| Article | On the Circular Closure of Languages | Dassow, J. | | 1979 |
| Article | On the Complexity of the General Coloring Problem | Maurer, H.A., Sudborough, J.H., Welzl, E. | | 1981 |
| Article | On the Decidability of the 0L-D0L Equivalence Problem | Ruohonen, K. | | 1979 |
| Article | On the Equality of Grammatical Families | Ginsburg, S., Goldstine, J., Spanier, E.H. | | 1983 |
| Article | On the Family of Finite Index Matrix Languages | Paun, Gh. | | 1979 |
| Article | On the Generative Power of Regular Pattern Grammars | Kleijn, H.C., Rozenberg, G. | | 1983 |
| Article | On the Impossibility of the Homomorphic Characterization of Context-Sensitive Languages | Okawa, S., Hirose, S., Yoneda, M. | | 1986 |
| Article | On the Limit Sets of Cellular Automata | Culik II, K., Pachl, J., Yu, S. | | 1989 |
| Article | On the Periodicity of Word-Length in D0L Languages | Ginsburg, S., Rovan, B. | | 1974 |
| Article | On the Sequence Equivalence Problem for 0L Systems with Controlled Derivations | Dassow, J. | | 1988 |
| Article | On the Syntactic Structures of Unrestricted Grammars I. Generative Grammars and Phrase Structure Grammars | Buttelmann, H.W. | | 1975 |
| Article | On the Syntactic Structures of Unrestricted Grammars II. Automata | Buttelmann, H.W. | | 1975 |
| Article | On the Unambiguity of n-tuple Languages | Hojka, N. | | 1975 |
| Article | On the complete simulation of D0L schemes and locally catenative schemes | Kobuchi, Y., Wood, D. | | 1980 |
| Article | On the complexity of formal grammars | Book, R.V. | | 1978 |
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