| Type | Title | Author | Publisher | Year |
| Article | One-Way Stack Automata | Ginsburg, S., Greibach, S.A., Harrison, M.A. | | 1967 |
| Article | Two-Way Pushdown Automata | Gray, J.N., Harrison, M.A., Ibarra, O.H. | | 1967 |
| Article | Algoritmiceskne jazyki i translirujuscne sistemy | Redko, V.N., Juscenko, E.L. | | 1967 |
| Article | A Contribution to the Top-to-Bottom Recognizer Rehabilitation | Kopriva, J. | | 1968 |
| Article | Pushdown Automaton with two Stacks as a Parsing Device | Kopriva, J. | | 1968 |
| Article | On sets of numbers not recognisable by pushdown automata | Bird, R.S. | | 1968 |
| Article | Algebraic structures of mathematical linguistics | Novotny, M. | | 1968 |
| Article | Some Theorems on Labelled Bracketings Used in Transformational Grammars | Culik, K. | | 1968 |
| Article | Nested Stack Automata | Aho, A.H. | | 1969 |
| Article | Generalized Sequential Machine Maps | Thatcher, J.W. | | 1969 |
| Article | On the equivalence and containment problems for context-free languages | Hopcroft, J.E. | | 1969 |
| Article | A note on top-down deterministic languages | Wood, D. | | 1969 |
| Article | Finite-Turn Checking Automata | Siromoney, R. | | 1969 |
| Article | A Direct Proof of the Inherent Ambiguity of a Simple Context-Free Language | Maurer, H.A. | | 1969 |
| Article | On Multiple Grammars | Kral, J. | | 1969 |
| Article | On grammars with restricted use of productions | Salomaa, A. | | 1969 |
| Article | Bounded Push Down Automata | Rovan, B. | | 1969 |
| Article | Properties of Syntax Directed Translations | Aho, A.H., Ullman, J.D. | | 1969 |
| Article | A Note on One-Sided Context-Sensitive Grammars | Havel, I. | | 1969 |
| Article | On multiple grammars | Kral, J. | | 1969 |
| Article | Notes on top-down languages | Kurki-Suonio, R. | | 1969 |
| Article | A Mathematical Model of Transformational Grammars | Ginsburg, S., Partee, B. | | 1969 |
| Article | Some considerations on fuzzy automata | Mizumoto, M., Toyoda, J., Tanaka, K. | | 1969 |
| Article | The algebra of derivations and a semithue parser | Benson, D.B. | | 1969 |
| Article | Scattered Context Grammars | Greibach, S., Hopcroft, J. | | 1969 |
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