Buinevičius, Kestutis, and Egidijus Puida. “Reduction of NOX Concentrations in Boiler Flue Gas by Injecting Selective Reagents”. Journal of Environmental Engineering and Landscape Management, vol. 13, no. 2, June 2005, pp. 91-96, https://doi.org/10.3846/16486897.2005.9636851.