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Siegl, Petr; Železný, Jakub; Krejčiřík, David (2014). On the similarity of Sturm-Liouville operators with non-Hermitian boundary conditions to self-adjoint and normal operators. Complex analysis and operator theory, 8(1), pp. 255-281. Birkhäuser 10.1007/s11785-013-0301-y
