1. The hardest language for grammars with context operators;Theoretical Computer Science;2023-05
2. The Hardest LL(k) Language;International Journal of Foundations of Computer Science;2023-02
3. On hardest languages for one-dimensional cellular automata;Information and Computation;2022-03
4. The Hardest LL(k) Language;Developments in Language Theory;2021
5. Hardest languages for conjunctive and Boolean grammars;Information and Computation;2019-06