1. Yu. F. Migal, J. Phys. B 27, 1515 (1994).
2. Yu. F. Migal, Physica B 208–209, 77 (1995).
3. Yu. F. Migal’, Zh. Strukt. Khim. 39, 1, 18 (1998).
4. Yu. F. Migal, J. Phys. IV 7, C2–169 (1997).
5. J. R. Taylor, Scattering Theory: The Quantum Theory of Nonrelativistic Collisions (Wiley, New York, 1972; Mir, Moscow, 1975, 565 pp.).