@article{oai:u-ryukyu.repo.nii.ac.jp:02005316,
 author = {Kudaka, Shoju and Matsumoto, Shuichi and 松本, 修一},
 journal = {Ryukyu mathematical journal},
 month = {Dec},
 note = {紀要論文},
 pages = {11--16},
 title = {On Schrödinger's variation principle},
 volume = {14},
 year = {2001}
}