Lychko, Volodymyr, et al. “DIFFERENTIAL DIAGNOSIS OF EXACERBATIONS AND PSEUDO-EXACERBATIONS AGAINST THE BACKGROUND OF SARS-COV-2 BY THE EXAMPLE OF A CLINICAL CASE OF A PATIENT WITH MULTIPLE SCLEROSIS”. Eastern Ukrainian Medical Journal, vol. 11, no. 1, Mar. 2023, pp. 47-52, doi:10.21272/eumj.2023;11(1):47-52.