@article{Matthews_1967,
    doi = {10.2307/2270782},
    url = {https://doi.org/10.2307%2F2270782},
    year = {1967},
    month = {oct},
    publisher = {Cambridge University Press ({CUP})},
    volume = {32},
    number = {3},
    pages = {388--389},
    author = {G. H. Matthews},
    title = {N. Chomsky and M. P. Schützenberger. The algebraic theory of context-free languages. Computer programming and formal systems, edited by P. Braffort and D. Hirschberg, Studies in logic and the foundations of mathematics, North-Holland Publishing Company, Amsterdam1963, pp. 118{\textendash}161.},
    journal = {Journal of Symbolic Logic}
}

@article{Matthews_1967, doi = {10.2307/2270782}, url = {https://doi.org/10.2307%2F2270782}, year = {1967}, month = {oct}, publisher = {Cambridge University Press ({CUP})}, volume = {32}, number = {3}, pages = {388--389}, author = {G. H. Matthews}, title = {N. Chomsky and M. P. Schützenberger. The algebraic theory of context-free languages. Computer programming and formal systems, edited by P. Braffort and D. Hirschberg, Studies in logic and the foundations of mathematics, North-Holland Publishing Company, Amsterdam1963, pp. 118{\textendash}161.}, journal = {Journal of Symbolic Logic} }