1. Ioffe, B.V., Refraktometricheskie metody khimii (Refractometric Methods of Chemistry), Leningrad: Khimiya, 1983.
2. Leikin, M.V., Molochnikov, B.I., Morozov, V.N., and Shakaryan, E.S., Otrazhatel’naya refraktometriya (Reflective Refractometry), Leningrad: Mashinostroenie, 1983.
3. Multiwave Refractometers Manufactured by Schmidt-Haensch Co. ( http:www.schmidt-haensch.com ) and Atago Co. ( http://www.atago.net ).
4. Iskhakov, B.O., Gataullin, G.A., Molochnikov, B.I., et al., Opt.-Mekh. Prom., 1979, no. 8, p. 24; http://www.baigish.ru/