Gu , Xian-MingZhao , Yong-LiangZhao , Xi-LeCarpentieri , Bruno and Huang , Yu-Yun. (2021). A Note on Parallel Preconditioning for the All-at-Once Solution of Riesz Fractional Diffusion Equations. Numerical Mathematics: Theory, Methods and Applications. 14 (4). 893-919. doi:10.4208/nmtma.OA-2020-0020