Yang Zhang,  Xuhong Yu &  Zhongqing Wang. (2021). Efficient and Accurate Legendre Spectral Element Methods for One-Dimensional Higher Order Problems.
            <i>Numerical Mathematics: Theory, Methods and Applications</i>. <i>14</i> (2).
            461-487.
         doi:10.4208/nmtma.OA-2020-0082