@article{SPS_1976__10__536_0,
     author = {Kazamaki, Norihiko},
     title = {A characterization of $BMO$ martingales},
     journal = {S\'eminaire de probabilit\'es de Strasbourg},
     pages = {536--538},
     publisher = {Springer - Lecture Notes in Mathematics},
     volume = {10},
     year = {1976},
     mrnumber = {445605},
     zbl = {0338.60028},
     language = {en},
     url = {http://www.numdam.org/item/SPS_1976__10__536_0/}
}