Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Surmardyono and Russasmita Sripadmi,Calculator For Critical Thinking In Mathematics Lesson:Experience With 4th Grade Students,Journal of Southeast Asian education,1513-4601,Southeast Asian Ministers of Education Organization,2020,2020,2,31-40,https://cir.nii.ac.jp/crid/1050865132203381632,