@article{Greibach_1970,
    doi = {10.1016/s0019-9958(70)80039-0},
    url = {https://doi.org/10.1016%2Fs0019-9958%2870%2980039-0},
    year = {1970},
    month = {mar},
    publisher = {Elsevier {BV}},
    volume = {16},
    number = {1},
    pages = {7--35},
    author = {Sheila A. Greibach},
    title = {Full {AFLs} and nested iterated substitution},
    journal = {Information and Control}
}

@article{Greibach_1970, doi = {10.1016/s0019-9958(70)80039-0}, url = {https://doi.org/10.1016%2Fs0019-9958%2870%2980039-0}, year = {1970}, month = {mar}, publisher = {Elsevier {BV}}, volume = {16}, number = {1}, pages = {7--35}, author = {Sheila A. Greibach}, title = {Full {AFLs} and nested iterated substitution}, journal = {Information and Control} }