1. Ullmanńs Encyclopedia of Industrial Chemistry;Lohbeck,2005
2. Kirk-Othmer Encyclopedia of Chemical Technology;Felthouse,2001
3. Commercial production of maleic anhydride by catalytic processes using fixed bed reactors
4. M. Becker, J. Walden, Producing Maleic Anhydride, EP174173 (1986).
5. G.T. Click, B.J. Barone, Steam Regeneration of Phosphorus Treated Vanadium-Phosphorus-Oxygen Catalysts, US4515899 (1985).