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Principal quadratic functionals. (English) Zbl 0041.22404

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[1] Gilbert A. Bliss, Lectures on the Calculus of Variations, University of Chicago Press, Chicago, Ill., 1946. · Zbl 0036.34401
[2] Bôcher, Maxime Leçons sur les méthodes de Sturm, Paris, Gauthier-Villars, 1917.
[3] 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
[4] Marston Morse and Walter Leighton, Singular quadratic functionals, Trans. Amer. Math. Soc. 40 (1936), no. 2, 252 – 286. · Zbl 0015.02701
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