@article{SHC_1962-1963__15__A3_0,
     author = {Cerf, Jean},
     title = {La nullit\'e de $\pi _0${(Diff} $S^3$). 1. {Position} du probl\`eme},
     journal = {S\'eminaire Henri Cartan},
     note = {talk:9-10},
     pages = {1--27},
     publisher = {Secr\'etariat math\'ematique},
     volume = {15},
     year = {1962-1963},
     zbl = {0117.16805},
     language = {fr},
     url = {http://www.numdam.org/item/SHC_1962-1963__15__A3_0/}
}