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Ibrogimov, Orif; Tretter, Christiane (2017). Essential spectrum of elliptic systems of pseudo-differential operators on L² (RN) ⊕ L²(RN). Journal of pseudo-differential operators and applications, 8(2), pp. 147-166. Springer 10.1007/s11868-017-0198-8
Ibrogimov, Orif (2017). Essential spectrum of non-self-adjoint singular matrix differential operators. Journal of mathematical analysis and applications, 451(1), pp. 473-496. Elsevier 10.1016/j.jmaa.2017.02.017
Ibrogimov, Orif; Siegl, Petr; Tretter, Christiane (2016). Analysis of the essential spectrum of singular matrix differential operators. Journal of differential equations, 260(4), pp. 3881-3926. Elsevier 10.1016/j.jde.2015.10.050
Balogh, Zoltan; Ibrogimov, Orif; Mityagin, Boris S. (2016). Functional equations and the Cauchy mean value theorem. Aequationes mathematicae, 90(4), pp. 683-697. Springer 10.1007/s00010-015-0395-6
Ibrogimov, Orif; Tretter, Christiane; Langer, Heinz; Langer, Matthias (2013). Essential spectrum of systems of singular differential equations. Acta Scientiarum Mathematicarum, 79(3-4), pp. 423-465. Bolyai Institute, University of Szeged
Ibrogimov, Orif; Tretter, Christiane (2018). On the spectrum of an operator in truncated Fock space. In: Alpay, Daniel; Kirstein, Bernd (eds.) Indefinite inner product spaces, Schur analysis, and differential equations. Operator Theory: Advances and Applications: Vol. 263 (pp. 321-334). Cham: Birkhäuser/Springer
