@article{SC_1971-1973__11-12__A2_0,
     author = {Piquet, Claude},
     title = {Propri\'et\'es des applications quadratiques d'un espace de {Hilbert} dans un espace vectoriel. {Applications} \`a la th\'eorie spectrale des op\'erateurs normaux et \`a l'image num\'erique d'un op\'erateur},
     journal = {S\'eminaire Choquet. Initiation \`a l'analyse},
     note = {talk:1},
     pages = {1--20},
     publisher = {Secr\'etariat math\'ematique},
     volume = {11-12},
     year = {1971-1973},
     mrnumber = {477811},
     zbl = {0341.43006},
     language = {fr},
     url = {http://www.numdam.org/item/SC_1971-1973__11-12__A2_0/}
}