James R. Kamm & Mikhail J. Shashkov. (2020). A Pressure Relaxation Closure Model for One-Dimensional, Two-Material Lagrangian Hydrodynamics Based on the Riemann Problem.
            <i>Communications in Computational Physics</i>. <i>7</i> (5).
            927-976.
         doi:10.4208/cicp.2009.09.032