@article{oai:niigata-u.repo.nii.ac.jp:00003070, author = {諏訪, 立雄}, issue = {2}, journal = {数学通信, 数学通信}, month = {Aug}, pages = {3--13}, title = {高校生のための数学春季特別講座 曲面にはどんな模様が描けるか}, volume = {4}, year = {1999} }