A backward problem for the time-fractional diffusion equation

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An inverse time-dependent source problem for a time-fractional diffusion equation (2016, unknown): “Liu and Yamamoto in [14] proposed a quasi-reversibility method for solving the backward problem of a fractional diffusion equation.”
An inverse problem for a one-dimensional time-fractional diffusion problem (2012, background): “Sakamoto and Yamamoto [23] established a generic well-posedness result and a uniqueness result for the inverse source problem.”
A tutorial on inverse problems for anomalous diffusion processes (2015, unknown): “Sakamoto and Yamamoto [89] discussed the inverse problem of determining a spatially varying function of the source term by ﬁnal overdetermined data in multi-dimension, and established its well-posedness in the Hadamard sense except for a discrete set of values of the diﬀusion constant, using an anal”