@article{SPS_1989__23__52_0,
     author = {Kikuchi, Masato},
     title = {The best estimation of a ratio inequality for continuous martingales},
     journal = {S\'eminaire de probabilit\'es de Strasbourg},
     pages = {52--56},
     publisher = {Springer - Lecture Notes in Mathematics},
     volume = {23},
     year = {1989},
     mrnumber = {1022897},
     zbl = {0745.60042},
     language = {en},
     url = {http://www.numdam.org/item/SPS_1989__23__52_0/}
}