H. P. Lopushanska, A. O. Lopushanskyj, E. V. Pasichnik, “The Cauchy problem in a space of generalized functions for the equations possessing the fractional time derivative”, Sibirsk. Mat. Zh., 52:6 (2011), 1288–1299; Siberian Math. J., 52:6 (2011), 1022–1031
