@article{SPS_1991__25__24_0,
     author = {Sch\"urmann, Michael},
     title = {The {Az\'ema} martingales as components of quantum independent increment processes},
     journal = {S\'eminaire de probabilit\'es de Strasbourg},
     pages = {24--30},
     publisher = {Springer - Lecture Notes in Mathematics},
     volume = {25},
     year = {1991},
     mrnumber = {1187766},
     zbl = {0745.60043},
     language = {fr},
     url = {http://www.numdam.org/item/SPS_1991__25__24_0/}
}