Lukyanchenko, O., O. Mel’nyk, O. Gozhenko, W. Zukow, and I. Popovych. “Features of the HRV, Endocrine and Metabolic Parameters in Persons Whose Immune Status Is Susceptible or Resistant to Chronic Stress”. Journal of Education, Health and Sport, vol. 10, no. 3, Mar. 2020, pp. 177-8, doi:10.12775/JEHS.2020.10.03.020.