Xueying Zhang &  Luyu Ran. (1970). Upwind Strategy for Localized Method of Approximate Particular Solutions with Applications to Convection Dominated Diffusion Problems.
            <i>Advances in Applied Mathematics and Mechanics</i>. <i>13</i> (2).
            455-466.
         doi:10.4208/aamm.OA-2019-0103