- S. A. Nazarov, K. Ruotsalainen, J. Taskinen, “Spectral gaps in the dirichlet and neumann problems on the plane perforated by a doubleperiodic family of circular holes”, J Math Sci, 181, № 2, 2012, 164
- Andrii Khrabustovskyi, “Opening up and control of spectral gaps of the Laplacian in periodic domains”, Journal of Mathematical Physics, 55, № 12, 2014, 121502
- Fedor L. Bakharev, Pavel Exner, “Geometrically Induced Spectral Effects in Tubes with a Mixed Dirichlet—Neumann Boundary”, Reports on Mathematical Physics, 81, № 2, 2018, 213
- Sergei A. Nazarov, Jari Taskinen, “Spectral gaps for periodic piezoelectric waveguides”, Z. Angew. Math. Phys., 66, № 6, 2015, 3017