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https://doi.org/10.1137/18M1180803 (Publisher version)
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Massei, S., Mazza, M., & Robol, L. (2019). Fast Solvers for Two-Dimensional Fractional Diffusion Equations Using Rank Structured Matrices. SIAM Journal on Scientific Computing, 41(4), A2627-A2656. doi:10.1137/18M1180803.