Chen , ZhenrongChen , Yanping and Huang , Yunqing. (2022). Piecewise Spectral Collocation Method for Second Order Volterra Integro-Differential Equations with Nonvanishing Delay.
            <i>Advances in Applied Mathematics and Mechanics</i>. <i>14</i> (6).
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         doi:10.4208/aamm.OA-2021-0334