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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
Brown, B. Malcolm; Langer, Matthias; Marletta, Marco; Tretter, Christiane; Wagenhofer, Markus (2010). Eigenvalue enclosures and exclosures for non-self-adjoint problems in hydrodynamics. LMS journal of computation and mathematics, 13, pp. 65-81. London: London Mathematical Society 10.1112/S1461157008000466
Langer, Heinz; Langer, Matthias; Markus, Alexander; Tretter, Christiane (2008). The Virozub–Matsaev Condition and Spectrum of Definite Type for Self-adjoint Operator Functions. Complex analysis and operator theory, 2(1), pp. 99-134. Basel: Birkhäuser 10.1007/s11785-007-0032-z
Langer, Matthias; Tretter, Christiane (2006). Variational principles for eigenvalues of the Klein-Gordon equation. Journal of mathematical physics, 47(10), p. 103506. Melville, N.Y.: American Institute of Physics 10.1063/1.2345108
