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Brown, B. Malcolm; Langer, Heinz; Tretter, Christiane (2019). Compressed resolvents and reduction of spectral problems on star graphs. Complex analysis and operator theory, 13(1), pp. 291-320. Birkhäuser 10.1007/s11785-018-0793-6
Engström, Christian; Langer, Heinz; Tretter, Christiane (2017). Rational eigenvalue problems and applications to photonic crystals. Journal of mathematical analysis and applications, 445(1), pp. 240-279. Elsevier 10.1016/j.jmaa.2016.07.048
Adamyan, V.; Langer, Heinz; Tretter, Christiane; Winklmeier, Monika (2016). Dirac-Krein systems on star graphs. Integral equations and operator theory, 86(1), pp. 121-150. Birkhäuser 10.1007/s00020-016-2311-4
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
