Dung T. Huynh. The Complexity of Ranking Simple Languages. Theory Comput. Syst., 23(1):1-19, 1990.
@article{Huynh90, title = {The Complexity of Ranking Simple Languages}, author = {Dung T. Huynh}, year = {1990}, researchr = {https://researchr.org/publication/Huynh90}, cites = {0}, citedby = {0}, journal = {Theory Comput. Syst.}, volume = {23}, number = {1}, pages = {1-19}, }