Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI)
早川 学而,Heron三角形の三角関数による解法,Journal of the Association for Mathematical Education of Japan,0021-471X,Japan Society of Mathematical Education (Association for Mathematical Education of Japan),1968,50,3,6,https://cir.nii.ac.jp/crid/1390008089765181184,https://doi.org/10.32296/jjsmep.50.3_6