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Everitt, W.N., Wray, S.D. (1983). On quadratic integral inequalities associated with second-order symmetric differential expressions. 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/BFb0076798
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