Houde Han, Min Tang and Wenjun Ying. (2014). Two Uniform Tailored Finite Point Schemes for the Two Dimensional Discrete Ordinates Transport Equations with Boundary and Interface Layers.
            <i>Communications in Computational Physics</i>. <i>15</i> (3).
            797-826.
         doi:10.4208/cicp.130413.010813a