Yonghui Qin, Yanping Chen, Yunqing Huang & Heping Ma. (2020). Multidomain Legendre-Galerkin Least-Squares Method for  Linear Differential Equations with Variable Coefficients.
            <i>Numerical Mathematics: Theory, Methods and Applications</i>. <i>13</i> (3).
            665-688.
         doi:10.4208/nmtma.OA-2019-0015