Media type: E-Article Title: Free vibration analysis of non-cylindrical helical springs by the pseudospectral method Contributor: Lee, Jinhee Published: Elsevier BV, 2007 Published in: Journal of Sound and Vibration, 305 (2007) 3, Seite 543-551 Language: English DOI: 10.1016/j.jsv.2007.04.017 ISSN: 0022-460X Keywords: Mechanical Engineering ; Mechanics of Materials ; Acoustics and Ultrasonics ; Condensed Matter Physics Origination: Footnote: