@article{McNaughton_1967,
    doi = {10.1145/321406.321411},
    url = {https://doi.org/10.1145%2F321406.321411},
    year = {1967},
    month = {jul},
    publisher = {Association for Computing Machinery ({ACM})},
    volume = {14},
    number = {3},
    pages = {490--500},
    author = {Robert McNaughton},
    title = {Parenthesis Grammars},
    journal = {Journal of the {ACM}}
}

@article{McNaughton_1967, doi = {10.1145/321406.321411}, url = {https://doi.org/10.1145%2F321406.321411}, year = {1967}, month = {jul}, publisher = {Association for Computing Machinery ({ACM})}, volume = {14}, number = {3}, pages = {490--500}, author = {Robert McNaughton}, title = {Parenthesis Grammars}, journal = {Journal of the {ACM}} }