Bojadziev, G. N. Non-linear vibrating systems in resonance governed by hyperbolic differential equations. (English) Zbl 0338.35007 Int. J. non-linear Mech. 11, 347-354 (1976). MSC: 35B40 35L10 35C05 35L60 PDFBibTeX XMLCite \textit{G. N. Bojadziev}, Int. J. Non-Linear Mech. 11, 347--354 (1976; Zbl 0338.35007) Full Text: DOI
Bojadziev, G. N.; Lardner, R. W. Second order hyperbolic equations with small non-linearities in the case of internal resonance. (English) Zbl 0287.35059 Int. J. non-linear Mech. 9, 397-407 (1974). MSC: 35L10 35L15 35B40 PDFBibTeX XMLCite \textit{G. N. Bojadziev} and \textit{R. W. Lardner}, Int. J. Non-Linear Mech. 9, 397--407 (1974; Zbl 0287.35059) Full Text: DOI
Bojadziev, G. N.; Lardner, R. W. Monofrequent oscillations in mechanical systems governed by second order hyperbolic differential equations with small non-linearities. (English) Zbl 0288.70011 Int. J. non-linear Mech. 8, 289-302 (1973). MSC: 70K99 74K10 35L60 PDFBibTeX XMLCite \textit{G. N. Bojadziev} and \textit{R. W. Lardner}, Int. J. Non-Linear Mech. 8, 289--302 (1973; Zbl 0288.70011) Full Text: DOI