@article{oai:omu.repo.nii.ac.jp:00007900,
 author = {Katayama, Noriaki},
 journal = {大阪府立工業高等専門学校研究紀要},
 month = {Oct},
 note = {application/pdf, Article, 大阪府立工業高等専門学校研究紀要, 1989, 23, p.9-14},
 pages = {9--14},
 title = {On First Integrals of Ermakov System},
 volume = {23},
 year = {1989}
}