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Wood, A.D., Paris, R.B. (1982). On some conjectures on the deficiency index for symmetric differential operators. In: Everitt, W., Sleeman, B. (eds) Ordinary and Partial Differential Equations. Lecture Notes in Mathematics, vol 964. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0065042
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DOI: https://doi.org/10.1007/BFb0065042
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