@article{SPS_1989__23__66_0, author = {\'Emery, Michel}, title = {On the {Az\'ema} martingales}, journal = {S\'eminaire de probabilit\'es de Strasbourg}, pages = {66--87}, publisher = {Springer - Lecture Notes in Mathematics}, volume = {23}, year = {1989}, zbl = {0753.60045}, mrnumber = {1022899}, language = {en}, url = {http://www.numdam.org/item/SPS_1989__23__66_0/} }