@article{GEA_1975-1976__1__A10_0,
     author = {J\"urgensen, Helmut},
     title = {Extensions par union},
     journal = {Groupe d'\'etude d'alg\`ebre},
     note = {talk:10},
     pages = {1--5},
     publisher = {Secr\'etariat math\'ematique},
     volume = {1},
     year = {1975-1976},
     zbl = {0391.20049},
     language = {fr},
     url = {http://www.numdam.org/item/GEA_1975-1976__1__A10_0/}
}