In this paper we investigate the eigenvalues and the spectral singularities of non-selfadjoint q-difference equations of second order with spectral singularities. © 2005 Elsevier Ltd. All rights reserved.
Adivar, M., & Bohner, M. (2006). Spectral analysis of q-difference equations with spectral singularities. Mathematical and Computer Modelling, 43(7–8), 695–703. https://doi.org/10.1016/j.mcm.2005.04.014