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Singular quadratic functionals. (English) Zbl 0015.02701

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[1] Ludwig Bieberbach, Theorie der Differentialgleichungen, 3rd ed., Grundlehren der Mathematischen Wissenschaften [Fundamental Principles of Mathematical Sciences], vol. 6, Springer-Verlag, Berlin-New York, 1979 (German). · Zbl 0063.00379
[2] George D. Birkhoff, A simplified treatment of the regular singular point, Trans. Amer. Math. Soc. 11 (1910), no. 2, 199 – 202. · JFM 41.0350.01
[3] Bôcher, Maxime. Leçons sur les méthodes de Sturm, Paris, Gauthier-Villars, 1917.
[4] Hardy, G. H., Littlewood, J. E., Pólya, G. Inequalities, Cambridge, University Press, 1934. · JFM 60.0169.01
[5] Kemble, E. C. Note on the Sturm-Liouville eigenvalue-eigenfunction problem with singular end-points, Proceedings of the National Academy of Sciences, vol. 19 (1933), pp. 710-714. · JFM 59.0448.03
[6] de la Vallée Poussin, Ch.-J. Analyse Infinitésimale, Tome I, Louvain, 1914. · JFM 45.0432.14
[7] 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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