1. 1. Bayevskiy R.M., Kirillov O.I., Kletskin S.Z. Matematicheskiy analiz izmeneniy serdechnogo ritma pri stresse [Mathematical Analysis of Heart Rate Changes Under Stress]. Moscow, Science Publ., 1984. 220 p.
2. 2. Gavrilova E.A. Sport, stress, variabel'nost': monografiya [Sport, Stress, Variability]. Moscow, Sport Publ., 2015. 168 p.
3. 3. Kuznetsov A.A. Biofizika serdtsa [Biophysics of the Heart]. Vladimir, VlGU Publ., 2013. 220 p.
4. 4. Mikhaylov V.M. Variabel'nost' ritma serdtsa (novyy vzglyad na staruyu paradigmu) [Heart Rate Variability (a New Look at the Old Paradigm)]. Ivanovo, 2017. 516 p.
5. 5. Uzunova A.N., Zaytseva M.L. Osnovnyye zakonomernosti fizicheskogo razvitiya detey: v pomoshch' prakticheskomu vrachu [The Main Patterns of the Physical Development of Children]. Chelyabinsk, Pirs Publ., 2015. 250 p.