Lagrange schwarzian derivative and symplectic Sturm theory
Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 2 (1993) no. 1, pp. 73-96. 
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     author = {Ovsienko, Valentin},
     title = {Lagrange schwarzian derivative and symplectic {Sturm} theory},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {73--96},
     publisher = {Universit\'e Paul Sabatier},
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     volume = {Ser. 6, 2},
     number = {1},
     year = {1993},
     mrnumber = {1230706},
     zbl = {0780.34004},
     language = {en},
     url = {http://www.numdam.org/item/AFST_1993_6_2_1_73_0/}
}
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Ovsienko, Valentin. Lagrange schwarzian derivative and symplectic Sturm theory. Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 2 (1993) no. 1, pp. 73-96. http://www.numdam.org/item/AFST_1993_6_2_1_73_0/

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