Seymour Ginsburg, Gene F. Rose. Preservation of Languages by Transducers. Inf. Comput., 9(2):153-176, April 1966.
@article{GinsburgR66, title = {Preservation of Languages by Transducers}, author = {Seymour Ginsburg and Gene F. Rose}, year = {1966}, month = {April}, researchr = {https://researchr.org/publication/GinsburgR66}, cites = {0}, citedby = {0}, journal = {Inf. Comput.}, volume = {9}, number = {2}, pages = {153-176}, }