Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Okuda Mitsunao,Motion of an Electron in the Magnetic Field of Helmholtz Coils,Journal of the Physics Education Society of Japan,0385-6992,The Physics Education Society of Japan,1991,39,4,235-238,https://cir.nii.ac.jp/crid/1390282679490693120,https://doi.org/10.20653/pesj.39.4_235