A Lagrangian Schwarzian derivative
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 6 (1989), pp. 42-45

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     author = {V. Yu. Ovsienko},
     title = {A {Lagrangian} {Schwarzian} derivative},
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     number = {6},
     year = {1989},
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     url = {http://geodesic.mathdoc.fr/item/VMUMM_1989_6_a9/}
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V. Yu. Ovsienko. A Lagrangian Schwarzian derivative. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 6 (1989), pp. 42-45. http://geodesic.mathdoc.fr/item/VMUMM_1989_6_a9/