Jin B, Lazarov R, Liu Y, Zhou Z (2015) The Galerkin finite element method for a multi-term time-fractional diffusion equation. Journal of Computational Physics 281: 825–843. Available: http://dx.doi.org/10.1016/j.jcp.2014.10.051.
The authors are grateful to the anonymous referees for their constructive comments. The research of B. Jin has been supported by NSF Grant DMS-1319052, R. Lazarov was supported in parts by NSF Grant DMS-1016525 and also by Award No. KUS-C1-016-04, made by King Abdullah University of Science and Technology (KAUST), and Y. Liu was supported by the Program for Leading Graduate Schools, MEXT, Japan.