Nenciu, Gheorghe On the smoothness of gap boundaries for generalized Harper operators. (English) Zbl 1199.47164 Boca, Florin-Petre (ed.) et al., Advances in operator algebras and mathematical physics. Proceedings of the 2nd conference on operator algebras and mathematical physics, Sinaia, Romania, June 26–July 4, 2003. Bucharest: Theta (ISBN 973-85432-7-4). Theta Series in Advanced Mathematics 5, 173-182 (2005). MSC: 47B39 35Q40 37A10 47N50 81Q10 PDFBibTeX XMLCite \textit{G. Nenciu}, Theta Ser. Adv. Math. 5, 173--182 (2005; Zbl 1199.47164) Full Text: arXiv
Ruppen, Hans-Jörg Conflicting nonlinearities and spectral lacunae bounded on one side by eigenvalues. (English) Zbl 1095.34051 Proc. R. Soc. Edinb., Sect. A, Math. 135, No. 5, 1041-1072 (2005). Reviewer: Hans-Peter Heinz (Mainz) MSC: 34L05 34B15 58E05 34L40 PDFBibTeX XMLCite \textit{H.-J. Ruppen}, Proc. R. Soc. Edinb., Sect. A, Math. 135, No. 5, 1041--1072 (2005; Zbl 1095.34051) Full Text: DOI
Yoshitomi, Kazushi Characterization of the absence of a spectral gap for a class of periodic Jacobi operators. (English) Zbl 1085.39019 Indag. Math., New Ser. 16, No. 2, 289-299 (2005). Reviewer: B. M. Agrawal (Gwalior) MSC: 39A70 39A11 PDFBibTeX XMLCite \textit{K. Yoshitomi}, Indag. Math., New Ser. 16, No. 2, 289--299 (2005; Zbl 1085.39019) Full Text: DOI
Kordyukov, Yuri A. Spectral gaps for periodic Schrödinger operators with strong magnetic fields. (English) Zbl 1095.34056 Commun. Math. Phys. 253, No. 2, 371-384 (2005). Reviewer: Marco Marletta (Cardiff) MSC: 34L40 34L20 PDFBibTeX XMLCite \textit{Y. A. Kordyukov}, Commun. Math. Phys. 253, No. 2, 371--384 (2005; Zbl 1095.34056) Full Text: DOI arXiv