Liang, Zhenguo; Wang, Xuting On reducibility of 1d wave equation with quasiperiodic in time potentials. (English) Zbl 1421.35202 J. Dyn. Differ. Equations 30, No. 3, 957-978 (2018). MSC: 35L20 35B15 35L05 37K55 PDFBibTeX XMLCite \textit{Z. Liang} and \textit{X. Wang}, J. Dyn. Differ. Equations 30, No. 3, 957--978 (2018; Zbl 1421.35202) Full Text: DOI
Akdoğan, Z.; Şaşmaz, Z. Sturm-Liouville problems with discontinuous potential. (English) Zbl 1173.34360 Bull. Aust. Math. Soc. 77, No. 3, 485-494 (2008). Reviewer: Hubert Kalf (München) MSC: 34L20 34B24 PDFBibTeX XMLCite \textit{Z. Akdoğan} and \textit{Z. Şaşmaz}, Bull. Aust. Math. Soc. 77, No. 3, 485--494 (2008; Zbl 1173.34360) Full Text: DOI
Brown, B. M.; McCormack, D. K. R.; Zettl, A. On the existence of an eigenvalue below the essential spectrum. (English) Zbl 0934.34073 Proc. R. Soc. Lond., Ser. A, Math. Phys. Eng. Sci. 455, No. 1986, 2229-2234 (1999). Reviewer: Vyacheslav Pivovarchik (Odessa) MSC: 34L15 34B24 PDFBibTeX XMLCite \textit{B. M. Brown} et al., Proc. R. Soc. Lond., Ser. A, Math. Phys. Eng. Sci. 455, No. 1986, 2229--2234 (1999; Zbl 0934.34073) Full Text: DOI
Eastham, M. S. P.; Kong, Q.; Wu, H.; Zettl, A. Inequalities among eigenvalues of Sturm-Liouville problems. (English) Zbl 0927.34017 J. Inequal. Appl. 3, No. 1, 25-43 (1999). Reviewer: Vyacheslav Pivovarchik (Odessa) MSC: 34B24 34L15 34L05 PDFBibTeX XMLCite \textit{M. S. P. Eastham} et al., J. Inequal. Appl. 3, No. 1, 25--43 (1999; Zbl 0927.34017) Full Text: DOI EuDML
Kuchment, Peter Floquet theory for partial differential equations. (English) Zbl 0789.35002 Operator Theory: Advances and Applications. 60. Basel: Birkhäuser Verlag. xiv, 350 p. (1993). Reviewer: B.Helffer (Paris) MSC: 35-02 35G10 35K25 65H10 35B99 47A53 PDFBibTeX XMLCite \textit{P. Kuchment}, Floquet theory for partial differential equations. Basel: Birkhäuser Verlag (1993; Zbl 0789.35002)
Beekmann, Brigitte; Lökes, Hermann Estimates for the eigenvalues of Hill’s equation and applications for the eigenvalues of the Laplacian on toroidal surfaces. (English) Zbl 0733.34080 Manuscr. Math. 68, No. 3, 295-308 (1990). Reviewer: L.Littlejohn (Logan) MSC: 34L15 34B30 PDFBibTeX XMLCite \textit{B. Beekmann} and \textit{H. Lökes}, Manuscr. Math. 68, No. 3, 295--308 (1990; Zbl 0733.34080) Full Text: DOI EuDML
Veliev, O. A. Spectrum of multidimensional periodic operators. (English. Russian original) Zbl 0696.47003 J. Sov. Math. 49, No. 4, 1045-1058 (1990); translation from Teor. Funkts., Funkts. Anal. Prilozh. 49, 17-34 (1988). MSC: 47A10 47F05 35J10 35B25 34C25 PDFBibTeX XMLCite \textit{O. A. Veliev}, J. Sov. Math. 49, No. 4, 1045--1058 (1990; Zbl 0696.47003); translation from Teor. Funkts., Funkts. Anal. Prilozh. 49, 17--34 (1988) Full Text: DOI
Veliev, O. A. On the spectrum of multidimensional periodic operators. (Russian) Zbl 0664.47005 Teor. Funkts., Funkts. Anal. Prilozh. 49, 17-34 (1988). Reviewer: J.Tian MSC: 47A10 47F05 35J10 35B25 34C25 PDFBibTeX XMLCite \textit{O. A. Veliev}, Teor. Funkts. Funkts. Anal. Prilozh. 49, 17--34 (1988; Zbl 0664.47005)
Richards, J. A. Analysis of periodically time-varying systems. (English) Zbl 0503.34002 Communications and Control Engineering Series. Berlin-Heidelberg-New York: Springer-Verlag. XV, 173 p., 73 figs. DM 84.00; $ 33.60 (1983). MSC: 34-01 34C25 93-01 93C15 PDFBibTeX XML
Harris, B. J. Some spectral gap results. (English) Zbl 0515.47023 Ordinary and partial differential equations, Proc. 6th Conf. Dundee 1980, Lect. Notes Math. 846, 148-157 (1981). MSC: 47E05 47A10 PDFBibTeX XML
Harris, B. J. On the spectra and stability of periodic differential equations. (English) Zbl 0479.34008 Proc. Lond. Math. Soc., III. Ser. 41, 161-192 (1980). MSC: 34L99 34D20 PDFBibTeX XMLCite \textit{B. J. Harris}, Proc. Lond. Math. Soc. (3) 41, 161--192 (1980; Zbl 0479.34008) Full Text: DOI