Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI)
Wada Toshiaki,Why do they write an arrow of gravity longer?(Salon),Journal of the Physics Education Society of Japan,0385-6992,The Physics Education Society of Japan,1987,35,1,51,https://cir.nii.ac.jp/crid/1390001204514880128,https://doi.org/10.20653/pesj.35.1_51