1. Updegraff, I. H.; Moore, S. T.; Herbes, W. F.; Roth, P. B.Kirk-Othmer Encyclopedia of Chemical Technology,3rd ed.John Wiley:New York, 1979; Vol.7, pp440–469.
2. May, D. R.Kirk-Othmer Encyclopedia of Chemical Technology,3rd ed.John Wiley:New York, 1979; Vol.7, pp302–306.
3. Green, R. V.; Li, H.Riegel’s Handbook of Industrial Chemistry,8th ed.Van Nostrand Reihold:New York, 1983; pp179.