@incollection{Choffrut_1979,
    doi = {10.1007/3-540-09510-1_8},
    url = {https://doi.org/10.1007%2F3-540-09510-1_8},
    year = {1979},
    publisher = {Springer Berlin Heidelberg},
    pages = {88--103},
    author = {C. Choffrut},
    title = {A generalization of Ginsburg and Rose{\textquotesingle}s characterization of G-S-M mappings},
    booktitle = {Automata, Languages and Programming}
}

@incollection{Choffrut_1979, doi = {10.1007/3-540-09510-1_8}, url = {https://doi.org/10.1007%2F3-540-09510-1_8}, year = {1979}, publisher = {Springer Berlin Heidelberg}, pages = {88--103}, author = {C. Choffrut}, title = {A generalization of Ginsburg and Rose{\textquotesingle}s characterization of G-S-M mappings}, booktitle = {Automata, Languages and Programming} }