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3. L. Boltzmann, Lectures on Gas Theory (S. Brush, transl.), University of California Press, Berkeley, California (1964).
4. M. Klein in: The Boltzmann Equation (E. G. D. Cohen and W. Thirring, eds.). Springer Verlag, Vienna (1973).
5. S. Chapman and T. G. Cowling, The Mathematical Theory of Non Uniform Gases, 3rd ed., Cambridge University Press, London (1970).