Michalow-Mauke, Katarzyna A., et al. “WO₃/CeO₂/TiO₂/Catalysts/for/Selective/Catalytic/Reduction/of/NOx/by/NH₃:/Effect/of/the/Synthesis/Method”. CHIMIA, vol. 69, no. 4, Apr. 2015, p. 220, doi:10.2533/chimia.2015.220.