@article{AIHPC_1988__5_4_323_0,
     author = {Mancini, Giovanni and Musina, Roberta},
     title = {Holes and obstacles},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {323--345},
     publisher = {Gauthier-Villars},
     volume = {5},
     number = {4},
     year = {1988},
     mrnumber = {963103},
     zbl = {0666.35039},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPC_1988__5_4_323_0/}
}