2 citations to https://www.mathnet.ru/eng/dan35121

1. A. K. Gushchin, “On the uniform stabilization of solutions of the second mixed problem for a parabolic equation”, Math. USSR-Sb., 47:2 (1984), 439–498        
2. Yu. N. Drozhzhinov, B. I. Zavialov, “Quasi-asymptotics of generalized functions and Tauberian theorems in the complex domain”, Math. USSR-Sb., 31:3 (1977), 329–345