On the one-dimensional reggeon model: eigenvalues of the Hamiltonian and the propagatorM. A. Braun, E. M. Kuzminskii, A. V. Kozhedub, A. M. Puchkov and M. I. VyazovskyEur. Phys. J. C, 79 8 (2019) 664DOI: https://doi.org/10.1140/epjc/s10052-019-7187-4