1. E. T. Gappoeva and D. B. Karsanova, Vestn. otorinolaringol., No. 1, 51–54 (2006).
2. S. A. Glantz, Primer of Biostatistics, 6th ed., New York, Mc-Graw-Hill, Medical Publishing Division (2002).
3. V. N. Krasnov, Psikhiatr. i Psikhofarmakoter., No. 5, 152–154 (2001).
4. O. V. Kubryak, Sotsiologich. Issled., No. 1, 100–108 (2010).
5. R. G. Oganov, A. D. Dyeev, G. V. Pogosova, et al., Kardiologiya, No. 2, 59–66 (2011).