V. V. Horodets’kyi, O. V. Martynyuk, and R. I. Petryshyn, “On generalized Cauchy problem for one class of differential equation of infinite order”, Ukr. Mat. Zhurn., vol. 72, no. 7, pp. 886–902, Jul. 2020, doi: 10.37863/umzh.v72i7.2321.