@article{AIHPC_1998__15_5_651_0,
     author = {San Mart{\'\i}n, Bernardo},
     title = {Contracting singular cycles},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {651--659},
     publisher = {Gauthier-Villars},
     volume = {15},
     number = {5},
     year = {1998},
     mrnumber = {1643401},
     zbl = {0942.37039},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_1998__15_5_651_0/}
}