Zielińska-Sitkiewicz, M. 2021. THE FLU: AN ANALYSIS OF ECONOMIC COSTS AND MORBIDITY RATES IN POLAND IN THE PERIOD 2013–2019 USING ADAPTIVE PREDICTION METHODS. Acta Scientiarum Polonorum. Oeconomia. 19, 4 (Jan. 2021), 139-146. DOI:https://doi.org/10.22630/ASPE.2020.19.4.50.