Persistence of homoclinic tangencies for area-preserving maps
Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 6 (1997) no. 4, pp. 711-725. 
@article{AFST_1997_6_6_4_711_0,
     author = {Mora, Leonardo and Romero, Neptal{\'\i}},
     title = {Persistence of homoclinic tangencies for area-preserving maps},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {711--725},
     publisher = {Universit\'e Paul Sabatier. Facult\'e des sciences},
     address = {Toulouse},
     volume = {Ser. 6, 6},
     number = {4},
     year = {1997},
     mrnumber = {1624318},
     zbl = {0932.37033},
     language = {en},
     url = {http://www.numdam.org/item/AFST_1997_6_6_4_711_0/}
}
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Mora, Leonardo; Romero, Neptalí. Persistence of homoclinic tangencies for area-preserving maps. Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 6 (1997) no. 4, pp. 711-725. http://www.numdam.org/item/AFST_1997_6_6_4_711_0/

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