@article{GAU_1976-1977__4__A12_0,
     author = {Escassut, Alain},
     title = {Sur la semi-norme spectrale sup\'erieure en alg\`ebre de {Banach} ultram\'etrique},
     journal = {Groupe de travail d'analyse ultram\'etrique},
     note = {talk:13},
     pages = {1--5},
     publisher = {Secr\'etariat math\'ematique},
     volume = {4},
     year = {1976-1977},
     zbl = {0377.46041},
     language = {fr},
     url = {http://www.numdam.org/item/GAU_1976-1977__4__A12_0/}
}