Geodesic
On Some Generalization of Inequalities of Opial, Yang and Shum
Canadian mathematical bulletin, Tome 23 (1980) no. 1, pp. 71-80

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In 1960, Z. Opial [20] proved the following interesting integral inequality:Theorem A. If u is a continuously differentiable function on [0, b], and if u(0) = u(b) = 0, and u(x)>0 for x∊(0, b), then 1 where the constant b/4 is the best possible. 
Lee, Cheng-Shyong. On Some Generalization of Inequalities of Opial, Yang and Shum. Canadian mathematical bulletin, Tome 23 (1980) no. 1, pp. 71-80. doi: 10.4153/CMB-1980-010-2
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