Zhao , MeilingHe , Wenjie and Gu , Gendai. (2021). A High-Order Piecewise Quartic Spline Rule for Hadamard Integral and Its Application of the Cavity Scattering.
            <i>Numerical Mathematics: Theory, Methods and Applications</i>. <i>14</i> (3).
            811-838.
         doi:10.4208/nmtma.2020-0163