- Tomas Ya. Azizov, Volker Hardt, Nikolay D. Kopachevsky, Reinhard Mennicken, “On the problem of small motions and normal oscillations of a viscous fluid in a partially filled container”, Mathematische Nachrichten, 248-249, no. 1, 2003, 3
- Peter Otte, “An adiabatic theorem for section determinants of spectral projections”, Mathematische Nachrichten, 278, no. 4, 2005, 470
- Aref Jeribi, Spectral Theory and Applications of Linear Operators and Block Operator Matrices, 2015, 23
- Orif O. Ibrogimov, “Essential spectrum of non-self-adjoint singular matrix differential operators”, Journal of Mathematical Analysis and Applications, 451, no. 1, 2017, 473
- Jiangang Qi, Shaozhu Chen, “Essential spectra of singular matrix differential operators of mixed order”, Journal of Differential Equations, 250, no. 12, 2011, 4219
- Jing Xu, Junjie Huang, Alatancang Chen, “Fredholm properties of a class of coupled operator matrices and their applications”, Ann. Funct. Anal., 15, no. 2, 2024, 12
- Volker Hardt, Reinhard Mennicken, Recent Advances in Operator Theory, 2001, 243
- Heinz Langer, Manfred Möller, “The Essential Spectrum of a Non‐Elliptic Boundary Value Problem”, Mathematische Nachrichten, 178, no. 1, 1996, 233
- M. Pribyl, “Analysis of spectral properties of operators for linearized steady-state equations of a viscous compressible heat-conducting fluid”, J Dyn Control Syst, 17, no. 2, 2011, 187
- K. Miloud Hocine, “Boundary value matrix problems and Drazin invertible operators”, Mat. Stud., 57, no. 1, 2022, 16