[1] [1] Colin S. Willett, Introduction to Gas Laser: Population Inversion Mechanisms, (Oxford, New York, Toronoto, Sudney 1974),13

[2] [2] L. E. Leob, Basic Processes of Gaseous Electron-ice (Univ. of Calilornia Pi ess; 1955), Chaoter 4

[3] [3] M. J. Druyvesteyn et al. Zeits f. Physik, 64, 790(1930)

[4] [4] J. D. Swift, Brit. J. Appl. Phys., 16, 8:37(1Э65)

[5] [5] Μ. Ζ. Novgorodov et al., IEEE J. Quant. Electr., QE—7, 508 (1971)

[6] [6] W. L. Nighan, Phys. Rev; A2, 1898 (1970)