BaranetskijYa.O., KalenyukP.I., KolyasaL.I., and KopachM.I. 2018. “The Nonlocal Problem for the Differential-Operator Equation of the Even Order With the Involution”. Carpathian Mathematical Publications 9 (2), 109-19. https://doi.org/10.15330/cmp.9.2.109-119.