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2. J.F. Byrne and H. Marsh in Porosity in Carbons, J.W. Patrick (ed.) (Edward Arnold, London, 1995), p. 2.
3. G.W. Stachowiak in Advances in Composite Tribology, Klaus Friedrich (ed.) (Elsevier Science Publishers, Amsterdam, 1993), p. 534.
4. B. Bhushan and B.K. Gupta, Handbook of Tribology, (McGraw-Hill Inc., New York, 1991) p. 5.1.
5. T. Okabe, K. Saito, and K. Hokkirigawa, Journal of Porous Materials 2, 207 (1996).