@article{StearnsHunt:JoC:1985,
    doi = {10.1137/0214044},
    url = {https://doi.org/10.1137%2F0214044},
    year = {1985},
    month = {aug},
    publisher = {Society for Industrial {\&} Applied Mathematics ({SIAM})},
    volume = {14},
    number = {3},
    pages = {598--611},
    author = {R. E. Stearns and H. B. Hunt III},
    title = {On the Equivalence and Containment Problems for Unambiguous Regular Expressions, Regular Grammars and Finite Automata},
    journal = {{SIAM} Journal on Computing}
}

@article{StearnsHunt:JoC:1985, doi = {10.1137/0214044}, url = {https://doi.org/10.1137%2F0214044}, year = {1985}, month = {aug}, publisher = {Society for Industrial {\&} Applied Mathematics ({SIAM})}, volume = {14}, number = {3}, pages = {598--611}, author = {R. E. Stearns and H. B. Hunt III}, title = {On the Equivalence and Containment Problems for Unambiguous Regular Expressions, Regular Grammars and Finite Automata}, journal = {{SIAM} Journal on Computing} }