Fractional Differential Calculus · Volume 11, Issue 2 On the backward problems in time for time-fractional subdiffusion equations 11-14 Pages 203-217 DOI 10.7153/fdc-2021-11-14 Downloads Short PDF Full PDF PNG Authors Shavkat Alimov Ravshan Ashurov Keywords Backward problem Riemann-Liouville derivatives subdiffusion equation Subject classes 35R11 34A12