@article{oai:nagoya.repo.nii.ac.jp:00031507,
 author = {Yamamoto, Toshio},
 issue = {2},
 journal = {Memoirs of the Faculty of Engineering, Nagoya University},
 month = {Feb},
 pages = {106--174},
 title = {On the critical speeds of a shaft},
 volume = {6},
 year = {1955}
}