@article{SD_1958-1959__12_1_A7_0,
     author = {Baer, Reinhold},
     title = {$\Sigma $ - fermeture},
     journal = {S\'eminaire Dubreil. Alg\`ebre et th\'eorie des nombres},
     note = {talk:7},
     pages = {1--3},
     publisher = {Secr\'etariat math\'ematique},
     volume = {12},
     number = {1},
     year = {1958-1959},
     zbl = {0116.01902},
     language = {fr},
     url = {http://www.numdam.org/item/SD_1958-1959__12_1_A7_0/}
}