Katima, J. H. Y., A. Azapagic, and D. Handley. 2018. “NITROGEN OXIDES ABSORPTION INTO SODIUM HYDROXIDE SOLUTION IN A PACKED COLUMN COLUMN: EFFECT OF NAOH CONCENTRATION”. Tanzania Journal of Engineering and Technology 15 (1). http://196.44.161.124/index.php/tjet/article/view/2188.