1. Encyclopedia of Chemical Technology;Kirk Othmer,1991
2. Applications of Transition-Metal Catalysts to Textile and Wood-Pulp Bleaching
3. J. Oakes, Patent EP0082563 (Unilever).
4. C.G. van Kralingen, R.J. Martens, M.E. Rerek, T. Swarthoff, M.R.P. van Vliet, Patent EP90200793 (Unilever).