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References
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© 1981 Springer-Verlag
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Read, T.T. (1981). Differential operators with discrete spectrum. In: Everitt, W.N., Sleeman, B.D. (eds) Ordinary and Partial Differential Equations. Lecture Notes in Mathematics, vol 846. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0089847
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DOI: https://doi.org/10.1007/BFb0089847
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