1. L. Boltzmann, Wien. Ber. 66, 275 (1872); Wien. Anz. 9, 23 (1872); Abh. 1, 316 (1872); Lectures on Gas Theory (University of California, Berkeley, 1964), translated by S.G. Brush
2. D. Enskog, K. Svensk. Vet.-Akad. Handl. 63(4) (1921)
3. N.N. Bogoliubov, J. Phys. (USSR) 10(256), 265 (1946); English translation in Studies in Statistical Mechanics, vol. 1, ed. by J. De Boer, G.E. Uhlenbeck (North-Holland, Amsterdam, 1962),
4. M. Born, H.S. Green, Proc. Roy. Soc. London A 188, 10 (1946); 190, 455 (1947)
5. J.G. Kirkwood, J. Chem. Phys. 14, 180 (1946)