@article{AIHPC_2011__28_1_91_0,
     author = {Ekeland, Ivar},
     title = {An inverse function theorem in {Fr\'echet} spaces},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {91--105},
     publisher = {Elsevier},
     volume = {28},
     number = {1},
     year = {2011},
     doi = {10.1016/j.anihpc.2010.11.001},
     mrnumber = {2765512},
     zbl = {1256.47037},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1016/j.anihpc.2010.11.001/}
}