@article{oai:iwate-u.repo.nii.ac.jp:00010903,
 author = {立花, 正男},
 journal = {岩手大学教育学部附属教育実践総合センター研究紀要, The journal of Clinical Research Center for Child Development and Educational Practices},
 month = {Mar},
 pages = {199--204},
 title = {円周率の指導について},
 volume = {12},
 year = {2013}
}