Generalized number operators defined in the space of a discrete time normal martingale functional
Yulan ZHOU, Huafang KONG, Xiuqiang CHENG, Rui XUE, Jia CHEN
Journal of East China Normal University(Natural Science) . 2022, (4): 13 -25 .  DOI: 10.3969/j.issn.1000-5641.2022.04.002