1. N.F. Mott, H.S.F. Massey: The Theory of Atomic Collisions (Pergamon, Oxford 1965)
2. M.L. Goldberger, K.M. Watson: Collision Theory (Wiley, New York 1964)
3. Ch.J. Joachain: Quantum Collision Theory (North-Holland, Amsterdam 1975)
4. M.R.H. Rudge: Rev. Mod. Phys. 40, 564 (1968)
5. R.P. Peterkop: Teoriya Ionizatsii Atomov Elektronnym Udarom (Theory of Ionization Atoms by Electron Impact, in Russian) (Zinatne, Riga 1975)