Alexander Okhotin. Nine Open Problems on Conjunctive and Boolean Grammars. Bulletin of the EATCS, 91:96-119, 2007.
@article{Okhotin07-1, title = {Nine Open Problems on Conjunctive and Boolean Grammars}, author = {Alexander Okhotin}, year = {2007}, researchr = {https://researchr.org/publication/Okhotin07-1}, cites = {0}, citedby = {0}, journal = {Bulletin of the EATCS}, volume = {91}, pages = {96-119}, }