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Behrndt, Jussi and Langer, Matthias and Lotoreichik, Vladimir (2013) Spectral estimates for resolvent differences of self-adjoint elliptic operators. Integral Equations and Operator Theory, 77 (1). pp. 1-37. ISSN 0378-620X
Brown, B. Malcolm and Langer, Heinz and Langer, Matthias (2013) Bessel-type operators with an inner singularity. Integral Equations and Operator Theory, 75 (2). pp. 257-300. ISSN 0378-620X
Strauss, Michael (2010) Spectral estimates and basis properties for self-adjoint block operator matrices. Integral Equations and Operator Theory, 67 (2). pp. 257-277. ISSN 0378-620X
Eschwe, D. and Langer, M. (2004) Variational principles for eigenvalues of self-adjoint operator functions. Integral Equations and Operator Theory, 49 (3). pp. 287-321. ISSN 0378-620X