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@article{FAA_1985_19_4_a0, author = {V. I. Arnol'd}, title = {The {Sturm} theorems and symplectic geometry}, journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a}, pages = {1--10}, publisher = {mathdoc}, volume = {19}, number = {4}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/FAA_1985_19_4_a0/} }
V. I. Arnol'd. The Sturm theorems and symplectic geometry. Funkcionalʹnyj analiz i ego priloženiâ, Tome 19 (1985) no. 4, pp. 1-10. http://geodesic.mathdoc.fr/item/FAA_1985_19_4_a0/