@article{oai:air.repo.nii.ac.jp:00004790,
 author = {長澤, 義博 and NAGASAWA, Yoshihiro},
 issue = {31},
 journal = {東北数学教育学会年報},
 month = {Mar},
 pages = {7--17},
 title = {自然界にある曲線と方程式},
 year = {2000}
}