1. Khafizova, S.R., Akhmetova, V.R., Kunakova, R.V., and Dzhemilev, U.M., Izv. Ross. Akad. Nauk, Ser. Khim., 2003, p. 1722.
2. Khafizova, S.R., Akhmetova, V.R., Korzhova, L.F., Khakimova, T.V., Nadyrgulova, G.R., Kunakova, R.V., Kruglov, E.A., and Dzhemilev, U.M., Izv. Ross. Akad. Nauk, Ser. Khim., 2005, p. 423.
3. Khafizova, S.R., Akhmetova, V.R., Nadyrgulova, G.R., Rusakov, I.V., Kunakova, R.V., and Dzhemilev, U.M., Neftekhimiya, 2005, p. 345.
4. Walker, J.F., Formaldehyde, New York: Reinhold, 1953, 2nd ed.
5. Aleev, R.S., Dal’nova, Yu.S., Popova, Yu.I., Masagutov, R.M., and Rafikov, S.R., Dokl. Akad. Nauk SSSR, 1988, vol. 303, p. 873.