| Type | Title | Author | Publisher | Year |
| Article | On commutative Kleene monoids | Rupert, C.P. | | 1991 |
| Article | Global context conditional grammars | Meduna, A. | | 1991 |
| Article | Languages and scanners | Beauquier, D., Pin, J.-E. | | 1991 |
| Article | Recognizable closures and submonoids of free partially commutative monoids | Hashiguchi, K. | | 1991 |
| Article | Fundamenta Informaticae, Volume XIV, Number 4 | Rasiowa, H. | | 1991 |
| Article | The string generating power of context-free hypergraph grammars | Engelfriet, J., Heyker, L. | | 1991 |
| Article | Global context conditional grammars | Meduna, A. | | 1991 |
| Article | Equality-test and if-then-else algebras: axiomatization and specification | Pigozzi, D. | | 1991 |
| Article | An annotated bibliography on parallel parsing | de Vreught, J.P.M. | | 1991 |
| Article | Graph grammars with path-controlled embedding | Aizawa, K., Nakamura, A. | | 1991 |
| Article | A deterministic algorithm for modular knapsack problems | Salomaa, A. | | 1991 |
| Article | Many aspects of formal languages | Salomaa, A. | | 1991 |
| Article | On bounded interpretations of grammar forms | Csuhaj-Varju, E., Dassow, J. | | 1991 |
| Article | Outfix and Infix codes and related classes of languages | Ito, M., Jurgensen, H., Shyr, H.J., Thierring, G. | | 1991 |
| Article | A perspective on coding theory | Blake, I.F. | | 1991 |
| Article | Multidimensional trees | Baldwin, W.A., Strawn, G.O. | | 1991 |
| Article | How to generate languages using only two pairs of parentheses | Geffert, V. | | 1991 |
| Article | On the power of cooperation: a regular representation of recursively enumerable languages | Csuhaj-Varju, E., Kelemen, J. | | 1991 |
| Article | Grammar systems and colonies | Kelemen, J. | | 1991 |
| Article | Abstract grammars based on trasnductions | Asveld, P.R.J. | | 1991 |
| Article | Deciding emptiness for stack automata on infinite trees | Harel, D., Raz, D. | | 1991 |
| Article | A periodic division pattern that cannot be generated by D0L systems | de Boer, M.J.M., Lindenmayer, A. | | 1991 |
| Article | Decision problems for finite string-resriting systems that are confluent on some congruence class | Otto, F., Zhang, L. | | 1991 |
| Article | Recognizable closures and submonoids of free partially commutative monoids | Hashiguchi, K. | | 1991 |
| Article | Machine characterization of (E0L-E0L) array languages | Nirmal, N., Rama, R. | | 1991 |
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