Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) FUJII Nobuaki,Using Multilevel Models to Analyze the Effects of Class Size and Small Group Learning on Pupils’ Academic Achievement,The Journal of Educational Research,13495836,The Chugoku-Shikoku Society for the Study of Education,2011,8,0,1-10,https://cir.nii.ac.jp/crid/1390282680759219968,https://doi.org/10.20677/csssej.8.0_1