@article{oai:omu.repo.nii.ac.jp:00008458,
 author = {Shirao, Yoshiaki and Kawabata, Hiroaki and Nagahara, Toshikuni and Inagaki, Yoshio},
 issue = {1},
 journal = {Bulletin of University of Osaka Prefecture. Series A, Engineering and natural sciences},
 month = {Oct},
 note = {application/pdf, Bulletin of University of Osaka Prefecture. Series A, Engineering and natural sciences. 1990, 39(1), p.19-28},
 pages = {19--28},
 title = {A study of Period-Doubling Bifurcations of 4/7-Harmonics in the Nonautonomous Piecewise Linear Systems with Unsymmetrical Restoring Force},
 volume = {39},
 year = {1990}
}