@incollection{SB_1956-1958__4__351_0,
     author = {Tits, Jacques},
     title = {Les {\guillemotleft} formes r\'eelles {\guillemotright} des groupes de type $E_6$},
     booktitle = {S\'eminaire Bourbaki : ann\'ees 1956/57 - 1957/58, expos\'es 137-168},
     series = {S\'eminaire Bourbaki},
     note = {talk:162},
     pages = {351--365},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {4},
     year = {1958},
     mrnumber = {1610950},
     zbl = {0084.25804},
     language = {fr},
     url = {http://www.numdam.org/item/SB_1956-1958__4__351_0/}
}