On storing ragged arrays by hashing. Some open problems in the theory of computation as questions about two-way deterministic pushdown automaton languages. Ronald V. Book . On languages with a certain prefix property. Wolfgang J. Paul , Robert Endre Tarjan , and James R. Celoni .
Space bounds for a game on graphs.
Observations about bounded languages and developmental systems. On the point transitivity of symbolic flows. Existence and uniqueness of minimal realizations of nonlinear systems. Perturbations of open sets of attainability. Comparing language operations.