1. "Le Système international d'unités (SI), 8e édition/The International System of Units (SI), 8th edition," ed. by Bureau international des poids et mesures, STEDI Media, Paris (2006);
2. URL:.
3. N. E. Holden, Chem. Int., 26, 4 (2004);
4. URL:.
5. 3) K. K. Murray, R. K. Boyd, M. N. Eberlin, G. J. Langley, L. Li, and Y. Naito, “Standard Definitions of Terms Related to Mass Spectrometry (IUPAC Recommendations 2006),” Draft, 31 Aug. 2006; p. 24; URL:<http://old.iupac.org/reports/provisional/abstract06/murray_prs.pdf>.