- Equations over sets of integers with addition only Artur Jeż Alexander Okhotin Thu 08 August 2019
- Unambiguous conjunctive grammars over a one-symbol alphabet Artur Jeż Alexander Okhotin Tue 30 January 2018
- Conjunctive Grammars over a Unary Alphabet: Undecidability and Unbounded Growth Artur Jeż Alexander Okhotin Fri 13 March 2015
- Representing Hyper-arithmetical Sets by Equations over Sets of Integers Artur Jeż Alexander Okhotin Tue 30 December 2014
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