@article{oai:teapot.lib.ocha.ac.jp:00034945, author = {Maeda, Michie and 前田, ミチエ}, issue = {1}, journal = {お茶の水女子大學自然科學報告}, month = {Jun}, note = {application/pdf, 紀要論文}, pages = {1--6}, title = {On a Problem Concerning Coincidence of Tangent Planes}, volume = {20}, year = {1969} }