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Multiple expansions in series of eigen- and associated functions of boundary eigenvalue problems nonlinearly dependent on the spectral parameter; Part I

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Freiling, G. Multiple expansions in series of eigen- and associated functions of boundary eigenvalue problems nonlinearly dependent on the spectral parameter; Part I. Results. Math. 17, 83–99 (1990). https://doi.org/10.1007/BF03322632

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