The Hardest LL(k) Language. - Mikhail Mrykhin; Alexander Okhotin (Int. J. Found. Comput. Sci., 2023)

The hardest language for grammars with context operators. - Mikhail Mrykhin; Alexander Okhotin (Theor. Comput. Sci., 2023)

On hardest languages for one-dimensional cellular automata. - Mikhail Mrykhin; Alexander Okhotin (Inf. Comput., 2023)