- Valentina S. Harizanov, “Turing degrees of hypersimple relations on computable structures”, Annals of Pure and Applied Logic, 121, № 2-3, 2003, 209
- Sergei Artemov, “2004 Annual Meeting of the Association for Symbolic Logic”, Bull. symb. log., 11, № 1, 2005, 92
- Ekaterina B. Fokina, Valentina Harizanov, Alexander Melnikov, Turing's Legacy, 2014, 124