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Cuenin, Jean-Claude; Siegl, Petr (2018). Eigenvalues of one-dimensional non-self-adjoint Dirac operators and applications. Letters in mathematical physics, 108(7), pp. 1757-1778. Springer 10.1007/s11005-018-1051-6
Mityagin, B.; Siegl, Petr (2016). Root system of singular perturbations of the harmonic oscillator type operators. Letters in mathematical physics, 106(2), pp. 147-167. Springer 10.1007/s11005-015-0805-7
