@article{BSMF_2003__131_4_603_0,
     author = {Bernard, Patrick},
     title = {The action spectrum near positive definite invariant tori},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {603--616},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {131},
     number = {4},
     year = {2003},
     doi = {10.24033/bsmf.2457},
     mrnumber = {2044497},
     zbl = {1053.37035},
     language = {en},
     url = {http://www.numdam.org/articles/10.24033/bsmf.2457/}
}