Luc Boasson. Two Iteration Theorems for Some Families of Languages. J. Comput. Syst. Sci., 7(6):583-596, 1973.
@article{Boasson73-0, title = {Two Iteration Theorems for Some Families of Languages}, author = {Luc Boasson}, year = {1973}, researchr = {https://researchr.org/publication/Boasson73-0}, cites = {0}, citedby = {0}, journal = {J. Comput. Syst. Sci.}, volume = {7}, number = {6}, pages = {583-596}, }