1. R.E. Kirk, D.F. Othmer (Eds.), Kirk–Other Encyclopedia of Chemical Technology, 2nd edn., Vol. 19, Interscience, New York, 1969, p. 134.
2. Z.B. Li et al. (Eds.), Encyclopedia of Chinese Chemical Products, 1st edn., Vol. 1, The Chinese Chemical Industry Press, Beijing, 1994, p. 540.