1. J.M. Anderson, Carbon Brushes for Motors, IEEE Power Engineering Review, January 1998.
2. C. Marcofu, E. Melehova, Copper–graphite brushes for starters, in: Proceedings of the Conference on Electrotechnical Materials, Inst. Project Res. Electrochem. Ind., Bucarest, Romania, 1970, p. 649.
3. Possibilities for the improvement of the composition and the quality of copper–graphite electric brushes;Todorova;Elektro Promeishlenost i Priborostroene,1979
4. UNE 20-027-78, Máquinas eléctricas rotativas, Métodos de ensayo para la medida de propiedades fı́sicas de los materiales de las escobillas.
5. ISO 2738: 1999 (E), Sintered metal materials, excluding hardmetals—permeable sintered metal materials—determination of density, oil content and open porosity.