@article{oai:iwate-u.repo.nii.ac.jp:00012430,
 author = {石川, 栄助},
 journal = {岩手大学学芸学部研究年報},
 month = {Jul},
 pages = {1--8},
 title = {二次曲面の分類},
 volume = {16},
 year = {1960}
}