1. M. E. Galagan, A. V. Shirokolava, and A. F. Vanin, Vopr. Med. Khimii, 37, No.1, 67–70 (1991).
2. S. A. Nadirashvili, Kh. M. Markov, V. S. Poleshchuk, et al., Functional Role of Nitric Monoxide and Purines [in Russian], Minsk (2001), pp. 78–80.
3. R. R. Nigmatullina, A. G. Nasyrova, and F. F. Rakhmatullina, Byull. Eksp. Biol. Med., 134, No.7, 40–44 (2002).
4. A. A. Sosunov, Sorosovsk. Obrazovat. Zh., 6, No.12, 26–34 (2000).
5. A. Kh. Urazaev and A. L. Zefirov, Usp. Fisiol. Nauk, 30, No.1, 54–72 (1999).