A. V. Zaborskiy, A. V. Nesterov, D. Yu. Nechaev, “Asymptotics of the solution to the Cauchy problem for a singularly perturbed operator differential transport equation in several space variables”, Zh. Vychisl. Mat. Mat. Fiz., 61:12 (2021), 2050–2058; Comput. Math. Math. Phys., 61:12 (2021), 2015–2023
