@article{Stanat_1972,
    doi = {10.1016/s0022-0000(72)80003-5},
    url = {https://doi.org/10.1016%2Fs0022-0000%2872%2980003-5},
    year = {1972},
    month = {jun},
    publisher = {Elsevier {BV}},
    volume = {6},
    number = {3},
    pages = {217--232},
    author = {Donald F. Stanat},
    title = {A homomorphism theorem for weighted context-free grammars},
    journal = {Journal of Computer and System Sciences}
}

@article{Stanat_1972, doi = {10.1016/s0022-0000(72)80003-5}, url = {https://doi.org/10.1016%2Fs0022-0000%2872%2980003-5}, year = {1972}, month = {jun}, publisher = {Elsevier {BV}}, volume = {6}, number = {3}, pages = {217--232}, author = {Donald F. Stanat}, title = {A homomorphism theorem for weighted context-free grammars}, journal = {Journal of Computer and System Sciences} }