1. Friction and wear of ceramics
2. Bürger, M.J. and Hendrick, S.B. (1938),Zeitschrift Kristallografische, Mineralien Petrograd Abt. A98, p. 1.
3. Zero Emission Engine — Der Dampfmotor mit isothermer Expansion
4. Der Dampfmotor — Entwicklungsstand und Marktchancen
5. Chen, G.X., Hu, Z.S. and Wang, J.X. et al. (2001), “Study on antiwear and reducing friction additive of nanometer cobalt hydroxide”,Journal of Society Tribologists and Lubrication Engineers, pp. 36‐9.