[18] Viswanathan B., Neel P.I., Varadarajan T.K., Methods of Activation and Specific Applications of Carbon Materials, National Centre for Catalysis Research, Indian Institute of Technology Madras, Chennai, 2009.
[30] Holm R., Electric Contacts: Theory and Application, Reprint of the 4th completely rewritten ed., Springer Verlag, Berlin/Heidelberg, 1967, p. 135.