1. V. P. Silin, Zh. Éksp. Teor. Fiz. 41, 861 (1961) [Sov. Phys. JETP 14, 617 (1962)].
2. V. P. Silin, Zh. Éksp. Teor. Fiz. 47, 2254 (1964) [Sov. Phys. JETP 20, 1510 (1964)].
3. E. M. Lifshitz and L. P. Pitaevskii, Physical Kinetics (Nauka, Moscow, 1979; Pergamon, Oxford, 1981).
4. V. P. Krainov, J. Phys. B 33, 1585 (2000).
5. V. P. Krainov, Zh. Éksp. Teor. Fiz. 119, 1109 (2001) [JETP 92, 960 (2001)].