Ruan , ZhoushengYang , Zhijian and Lu , Xiliang. (2018). An Inverse Source Problem with Sparsity Constraint for the Time-Fractional Diffusion Equation.
            <i>Advances in Applied Mathematics and Mechanics</i>. <i>8</i> (1).
            1-18.
         doi:10.4208/aamm.2014.m722