1. N. N. Bogolyubov, Soobshchenie E17-11822 [in English], JINR, Dubna (1978).
2. J. Perina,Quantum Statistics of Linear and Nonlinear Optical Phenomena, Reidel, Dordrecht (1984).
3. R. J. Glauber, in:Quantum Optics and Quatum Electronics [collection of Russian translation],, Mir, Moscow (1966).
4. A. S. Shumovsky, in: Ninth General Conference on Condensed Matter, Div. EPS (eds. J. P. Laheurte, M. Le Bella,, and F. Raymond), EPS, Nice (1989), p. A223.
5. A. S. Shumovsky and K. Rustamov, in:Selected Topics in Statistical Mechanics (eds. A. A. Logunov, N. N. Bogolyubov (Jr.), V. G. Kadyshevsky, and A. S. Shumovsky), World Scientific, Singapore (1990), p. 255.