Phan Thanh Nam Dang Duc Trong Nguyen Huy Tuan The truncation method for a two-dimensional nonhomogeneous backward heat problem. 3423-3432 2010 216 Appl. Math. Comput. 12 https://doi.org/10.1016/j.amc.2010.03.038 db/journals/amc/amc216.html#NamTT10
