1. Khimicheskaya Entsiklopediya [Chemical Encyclopedia], Nauch. izd-vo Bol’shaya rossiiskaya entsiklopediya, Moscow, 1998, Vol. 5, p. 346, column 683 (in Russian).
2. IUPAC Compendium of Chemical Terminology — the Gold Book, Version 2.3.2. 2012-08-19; http://gold.book.iupac.org .
3. Nomenklaturnye Pravila IYuPAK po Khimii [IUPAC Nomenclature Rules in Chemistry], Physical Organic Chemistry, Moscow, 1985, Vol. 5 (in Russian).
4. Glossary of Terms Used in Physical Organic Chemistry (IUPAC recommendations 1994), Pure Appl. Chem., 1994, 66, 1077; http://www.iupac.org/publications/pac/1994/pdf/6605x1077.pdf .
5. N. M. Emanuel’, D. G. Knorre, Kurs Khimicheskoi Kinetiki [Course on Chemical Kinetics], Vysshaya shkola, Moscow, 1984, p. 309 (a), 349 (b) (in Russian).