@article{ASENS_2009_4_42_5_857_0,
     author = {Opshtein, Emmanuel},
     title = {$\mathcal {C}^0$-rigidity of characteristics in symplectic geometry},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {857--864},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {Ser. 4, 42},
     number = {5},
     year = {2009},
     doi = {10.24033/asens.2111},
     mrnumber = {2571960},
     zbl = {1186.53054},
     language = {en},
     url = {http://archive.numdam.org/articles/10.24033/asens.2111/}
}