Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) YAMAMORI Koyo,Class Size Difference in the Five-year Transition of Elementary School Students' Japanese-language Achievement,THE JAPANESE JOURNAL OF EDUCATIONAL RESEARCH,0387-3161,Japanese Educational Research Association,2023,90,2,273-284,https://cir.nii.ac.jp/crid/1390860322092733952,https://doi.org/10.11555/kyoiku.90.2_273