@article{DIA_1980__3__A3_0,
     author = {Guitart, R.},
     title = {Extenseurs},
     journal = {Diagrammes},
     note = {talk:3},
     pages = {G1--G2},
     publisher = {Universit\'e Paris 7, Unit\'e d'enseignement et de recherche de math\'ematiques},
     volume = {3},
     year = {1980},
     mrnumber = {684911},
     zbl = {0509.18009},
     language = {fr},
     url = {http://archive.numdam.org/item/DIA_1980__3__A3_0/}
}