E. U. Condon, P. M. Morse, “Quantum Mechanics of Collision Processes I. scattering of particles in a definite force field”, Rev. Mod. Phys., 3, № 1, 1931, 43
N M Nagornyi, N A Shanin, “ANDREI ANDREEVICH MARKOV (on the occasion of his 60th birthday)”, Russ. Math. Surv., 19, № 3, 1964, 181
N.M. Nagorny, 134, Logic, Methodology and Philosophy of Science IX, Proceedings of the Ninth International Congress of Logic, Methodology and Philosophy of Science, 1995, 467
E. U. Condon, Selected Scientific Papers of E.U. Condon, 1991, 149