Abstract
We describe a wide class of two-dimensional potential Schroedinger and Dirac operators which are finite-gap at the zero energy level and whose spectral curves at this level are singular, in particular may have n-multiple points with n≥3.
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Taimanov, I.A. On Two-Dimensional Finite-Gap Potential Schroedinger and Dirac Operators with Singular Spectral Curves. Siberian Mathematical Journal 44, 686–694 (2003). https://doi.org/10.1023/A:1024792708878
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DOI: https://doi.org/10.1023/A:1024792708878