%0 Journal Article %A Wei, Ting %A Xian, Jun %T Variational method for a backward problem for a time-fractional diffusion equation %J ESAIM: Mathematical Modelling and Numerical Analysis %D 2019 %P 1223-1244 %V 53 %N 4 %I EDP-Sciences %U http://archive.numdam.org/articles/10.1051/m2an/2019019/ %R 10.1051/m2an/2019019 %G en %F M2AN_2019__53_4_1223_0