I. N. Hayrapetian and G. A. Martoyan, “METHOD OF CALCULATION NEUTRON FLUX IN FLAT MEDIUM”, Proc. YSU A: Phys. Math. Sci., vol. 34, no. 2 (193), pp. 52–55, Oct. 2000, doi: 10.46991/PYSUA.2000.34.2.052.