1. Glybin LIa, Sviatukha VA, Tsitsiashvili GSh. Statistical approach to the validity of a diurnal cycle with periods of 4-6 hours. Biofizika. 1995;40(4):829-33. Russian.
2. Gorgo YuP. Environmental significance of ultralow frequency fluctuation of atmospheric pressure in humans. Vestn. Kaluzh. Univer. 2009;(2):3-9. Russian.
3. Gorgo YuP, Didyk LA. Biological activity and significance of ultralow frequency fluctuation of atmospheric pressure. Biotropic Effects of Space Weather. St. Petersburg, 2010. P. 259-289. Russian.
4. Diatroptov ME. The influence of the lighting mode on the ultradian rhythm of testosterone level in the serum of male rabbits. Geofiz. Prots. Biosfera. 2013;12(1):62-69. Russian.
5. Martyniuk VS. The synchronizing effect of infralow frequency magnetic fields on biological systems. Biofizika. 1992;37(4):669-673.