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Bennewitz, C., Everitt, W.N. (1983). On second-order left-definite boundary value problems. In: Everitt, W.N., Lewis, R.T. (eds) Ordinary Differential Equations and Operators. Lecture Notes in Mathematics, vol 1032. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0076792
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DOI: https://doi.org/10.1007/BFb0076792
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