Yang, Xiangdong On completeness of root vectors of Schrödinger operators: a spectral approach. (English) Zbl 1412.35016 J. Nonlinear Sci. Appl. 10, No. 1, 227-233 (2017). MSC: 35A99 30B60 PDFBibTeX XMLCite \textit{X. Yang}, J. Nonlinear Sci. Appl. 10, No. 1, 227--233 (2017; Zbl 1412.35016) Full Text: DOI
Laptev, Ari; Peicheva, Anastasiya; Shlapunov, Alexander Finding eigenvalues and eigenfunctions of the Zaremba problem for the circle. (English) Zbl 1367.47052 Complex Anal. Oper. Theory 11, No. 4, 895-926 (2017). MSC: 47F05 35J57 30B60 34B24 PDFBibTeX XMLCite \textit{A. Laptev} et al., Complex Anal. Oper. Theory 11, No. 4, 895--926 (2017; Zbl 1367.47052) Full Text: DOI Link