Li , LingfengLuo , ShoushengTai , Xue-Cheng and Yang , Jiang. (2021). A Level Set Representation Method for $N$-Dimensional Convex Shape and Applications.
            <i>Communications in Mathematical Research </i>. <i>37</i> (2).
            180-208.
         doi:10.4208/cmr.2020-0034