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Cited by: 

1. F. Atkinson, H. Langer, R. Mennicken, A. A. Shkalikov, The essential spectrum of some matrix operators, Math. Nachr. 167 (1994), 5-20.

2. V. Adamyan, H. Langer, R. Mennicken, J. Sauder, Spectral components of selfadjoint block operator matrices with unbounded entries, Math. Nachr. 178 (1996), 43-80.

3. H. Langer, M. Moller, The essential spectrum of a non-elliptic boundary value problem, Math. Nachr. 178 (1996), 233-248.

4. V. Adamyan, R. Mennicken, J. Sauder, On the discrete spectrum of some selfadjoint operator matrices, J. Operator Theory 39 (1998), 3-41.

5. C. Tretter, Spectral issues for block operator matrices, In: Differential equations and mathematical physics (Birmingham, AL, 1999), AMS/IP Stud. Adv. Math. 16 (2000) 407–423.

6. A.Y. Konstantinov, On the essential spectrum of a class of matrix differential operators, Funct. Anal. Appl. 36 (2002), 233-235.

7. C. Tretter, Spectral Theory of Block Operator Matrices and Applications, Imperial College Press, London, 2008.

8. O. Yu. Konstantinov, Yu. M. Grinyk, The essential spectrum of one non-elliptic boundary-value problem, Bulletin of Taras Shevchenko National University of Kyiv, Series: Physics and Mathematics (2013), no. 4, 51–54.

9. O. Ibrogimov, Essential spectrum of non-self-adjoint singular matrix differential operators, J. Math. Anal. Appl. 451 (2017), 473–496.

10. J. Xu, J. Huang, A. Chen, Fredholm properties of a class of coupled operator matrices and their applications, Annals of Functional Analysis, 15 (2024), article no. 12, https://doi.org/10.1007/s43034-024-00318-z .