Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Toma Eiji and Kasai Neo,New Method for Analyzing COVID-19 Infection Status by Integrating Infectious Disease SIR Mathematical Model and Multivariate Analysis Method,The Japanese Journal of the Institute of Industrial Applications Engineers,2189-373X,The Institute of Industrial Applications Engineers,2022,10,1,52-61,https://cir.nii.ac.jp/crid/1390010292655099264,https://doi.org/10.12792/jjiiae.10.1.52