Chen , SongzeXu , Kun and Cai , Qingdong. (2018). A Comparison and Unification of Ellipsoidal Statistical and Shakhov BGK Models.
            <i>Advances in Applied Mathematics and Mechanics</i>. <i>7</i> (2).
            245-266.
         doi:10.4208/aamm.2014.m559