@article{SMS_1969-1970__1__A12_0,
     author = {Lenormand, Claude},
     title = {Exponentiation de la d\'erivation, et int\'egration des s\'eries en variables non commutatives},
     journal = {S\'eminaire Sch\"utzenberger},
     note = {talk:20},
     pages = {1--7},
     publisher = {Secr\'etariat math\'ematique},
     volume = {1},
     year = {1969-1970},
     mrnumber = {286844},
     zbl = {0221.16027},
     language = {fr},
     url = {http://archive.numdam.org/item/SMS_1969-1970__1__A12_0/}
}