1. Morozov A. S., “On the relation of Σ-reducibility between admissible sets,” Siberian Math. J., 45, No. 3, 522–535 (2004).
2. Puzarenko V. G., “Admissible sets: Elementary description and computability,” in: Proceedings of III Conference of Young Scientists of Siberian Branch of Russian Academy of Sciences Dedicated to the Memory of M. A. Lavrent’ev, Novosibirsk Univ., Novosibirsk, 2003, pp. 39–44.
3. Puzarenko V. G., “Admissible sets: Elementary description and computability. Part 2,” in: Proceedings of IV Conference of Young Scientists of Siberian Branch of Russian Academy of Sciences Dedicated to the Memory of M. A. Lavrent’ev, Novosibirsk Univ., Novosibirsk, 2004, pp. 34–36.
4. Puzarenko V. G., “Generalized numberings and definability of the field R in admissible sets,” Vestnik NGU Ser. Mat. Mekh. Inform., 3, No. 2, 107–117 (2003).
5. Morozov A. S. and Puzarenko V. G., “Σ-subsets of natural numbers,” Algebra and Logic, 43, No. 3, 162–178 (2004).