@article{{MRA}{}, author = {Liu, Y., Yu, C., Shen, K.}, title = { Researches on the COVID-19 epidemic in the world within a nonextensive SIR model}, journal = {Medical Research Archives}, volume = {10}, number = {6}, year = {2022}, doi = {10.18103/mra.v10i6.2904}, url = {https://esmed.org/MRA/mra/article/view/2904} }