@article{oai:gifu-u.repo.nii.ac.jp:00065960,
 author = {TAKEUCHI, Shigeru},
 journal = {岐阜大学教育学部研究報告. 自然科学},
 month = {Feb},
 note = {論文(Article)},
 pages = {1--6},
 title = {On some aspects of non-euclidean plane geometries},
 volume = {31},
 year = {2007}
}