Zhousheng Ruan, Jerry Zhijian Yang & Xiliang Lu. (1970). Tikhonov Regularisation Method for Simultaneous Inversion of the Source Term and Initial Data in a Time-Fractional Diffusion Equation.
            <i>East Asian Journal on Applied Mathematics</i>. <i>5</i> (3).
            273-300.
         doi:10.4208/eajam.310315.030715a