Geodesic
Morse lemma for functionals of variational calculus
Funkcionalʹnyj analiz i ego priloženiâ, Tome 25 (1991) no. 3, pp. 1-11 
N. A. Bobylev; Yu. M. Burman. Morse lemma for functionals of variational calculus. Funkcionalʹnyj analiz i ego priloženiâ, Tome 25 (1991) no. 3, pp. 1-11. http://geodesic.mathdoc.fr/item/FAA_1991_25_3_a0/
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