Rongpei Zhang, Xijun Yu, Jiang Zhu, Abimael F. D. Loula and Xia Cui. (2013). Weighted Interior Penalty Method with Semi-Implicit Integration Factor Method for Non-Equilibrium Radiation Diffusion Equation.
            <i>Communications in Computational Physics</i>. <i>14</i> (5).
            1287-1303.
         doi:10.4208/cicp.190612.010313a