Geodesic
A note on the definiteness of the differential equations $y'' = q(t)y$
Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, Tome 12 (1972) no. 1, pp. 19-22

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Classification : 34C10 
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     title = {A note on the definiteness of the differential equations $y'' = q(t)y$},
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Krbiľa, Jaroslav. A note on the definiteness of the differential equations $y'' = q(t)y$. Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, Tome 12 (1972) no. 1, pp. 19-22. http://geodesic.mathdoc.fr/item/AUPO_1972__12_1_a2/