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3. O. E. Lanford, “Time evolution of large classical systems,” Lect. Notes Phys., No. 38 (1975).
4. V. I. Gerasimenko and D. Ya. Petrina, “Existence of the Boltzmann-Grad limit for an infinite system of hard spheres,” Teor. Mat. Fiz., 83, 92–114 (1990).
5. D. Ya. Petrina and V. I. Gerasimenko, “Mathematical problems of statistical mechanics of a system of hard-sphere particles,” Usp. Mat. Nauk, 45, 192–214 (1990).