@article{SPS_1986__20__375_0,
     author = {van der Vecht, D. P.},
     title = {Ultimateness and the {Az\'ema-Yor} stopping time},
     journal = {S\'eminaire de probabilit\'es de Strasbourg},
     pages = {375--378},
     publisher = {Springer - Lecture Notes in Mathematics},
     volume = {20},
     year = {1986},
     mrnumber = {942032},
     zbl = {0624.60089},
     language = {en},
     url = {http://www.numdam.org/item/SPS_1986__20__375_0/}
}