Hongfei Chen, Gaoyu Chen, Xiang Hong, Hao Gao and Min Tang. (2018). A Uniformly Convergent Scheme for Radiative Transfer Equation in the Diffusion Limit Up to the Boundary and Interface Layers.
            <i>Communications in Computational Physics</i>. <i>24</i> (4).
            1021-1048.
         doi:10.4208/cicp.2018.hh80.06