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Everitt, W.N., Giertz, M. (1975). On the deficiency indices of powers of formally symmetric differential expressions. In: Everitt, W.N. (eds) Spectral Theory and Differential Equations. Lecture Notes in Mathematics, vol 448. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0067086
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DOI: https://doi.org/10.1007/BFb0067086
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