1. Sputtering by Particle Bombardment, Ed. by R. Behrisch (Springer, New York, 1981; Mir, Moscow, 1984), Vol. 1.
2. P. Sigmund, Phys. Rev. 184, 377 (1969)
3. K. T. Waldeer and H. M. Urbassek, Appl. Phys. A 45, 207 (1988).
4. A. I. Tolmachev, Nucl. Instrum. Methods Phys. Res. B 83, 479 (1993).
5. S. Chandrasekar, Radiative Transfer (Oxford Univ., Oxford, 1950; Inostrannaya Literatura, Moscow, 1956).