Comparison theorems for linear differential equations of second order. (English) Zbl 0118.08202

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[1] Maxime Bôcher, Leçons sur les methodes de Sturm, Gauthier-Villars, Paris, 1917.
[2] E. L. Ince, Ordinary differential equations, Longmans, London, 1927. · JFM 53.0399.07
[3] Walter Leighton, A substitute for the Picone formula, Bull. Amer. Math. Soc. 55 (1949), 325 – 328. · Zbl 0032.34702
[4] Marston Morse, The calculus of variations in the large, American Mathematical Society Colloquium Publications, vol. 18, American Mathematical Society, Providence, RI, 1996. Reprint of the 1932 original. · Zbl 0011.02802
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