Kadyrov, S., Orynbassar, A. and Saydaliev, H.B. 2021. Purely Data-driven Exploration of COVID-19 Pandemic After Three Months of the Outbreak. Journal of Mathematical and Fundamental Sciences. 53, 3 (Dec. 2021), 358-368. DOI:https://doi.org/10.5614/j.math.fund.sci.2021.53.3.2.