- Nedra Moalla, Mondher Damak, Aref Jeribi, “Essential spectra of some matrix operators and application to two-group transport operators with general boundary conditions”, Journal of Mathematical Analysis and Applications, 323, no. 2, 2006, 1071
- H. Langer, A. Markus, V. Matsaev, C. Tretter, “Self-adjoint block operator matrices with non-separated diagonal entries and their Schur complements”, Journal of Functional Analysis, 199, no. 2, 2003, 427
- D. A. Zakora, “Spectral Properties of Operators in the Problem on Normal Oscillations of a Mixture of Viscous Compressible Fluids”, J Math Sci, 2024