@article{oai:nagoya.repo.nii.ac.jp:00031184,
 author = {Yamamoto, Toshio and Saito, Akihiko},
 issue = {1},
 journal = {Memoirs of the Faculty of Engineering, Nagoya University},
 month = {Sep},
 pages = {54--123},
 title = {On the vibrations of "summed and differential types" under parametric excitation},
 volume = {22},
 year = {1970}
}