Nazarov, S. A. An example of multiple gaps in the spectrum of a periodic waveguide. (English. Russian original) Zbl 1193.35038 Sb. Math. 201, No. 4, 569-594 (2010); translation from Mat. Sb. 201, No. 4, 99-124 (2010). Cited in 7 Documents MSC: 35J57 Boundary value problems for second-order elliptic systems 35J20 Variational methods for second-order elliptic equations 35P15 Estimates of eigenvalues in context of PDEs 78A50 Antennas, waveguides in optics and electromagnetic theory Keywords:gaps in the essential spectrum; formally self-adjoint elliptic system of differential equations with polynomial property PDF BibTeX XML Cite \textit{S. A. Nazarov}, Sb. Math. 201, No. 4, 569--594 (2010; Zbl 1193.35038); translation from Mat. Sb. 201, No. 4, 99--124 (2010) Full Text: DOI