J. Hartmanis. Context-free languages and Turing machine computations. Mathematical aspects of computer science, Proceedings of symposia in applied mathematics, vol. 19, American Mathematical Society, Providence1967, pp. 42–51.
S. Ginsburg · Journal of Symbolic Logic · 1972
J. Hartmanis. Context-free languages and Turing machine computations. Mathematical aspects of computer science, Proceedings of symposia in applied mathematics, vol. 19, American Mathematical Society, Providence1967, pp. 42–51. - Volume 37 Issue 4