Popovych, Igor, et al. “Relationships Between Geomagnetic Ар-Indeх and Parameters of the Immunity in Patients With Multiple Sclerosis and Radiculopathies”. Journal of Education, Health and Sport, vol. 11, no. 3, Mar. 2021, pp. 77-90, doi:10.12775/JEHS.2021.11.03.009.