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Mills, Andrew; Wells, Nathan (2015). "Indoor and outdoor monitoring of photocatalytic activity using a mobile phone app. and a photocatalytic activity indicator ink (paii)". Journal of Photochemistry and Photobiology A: Chemistry. 298: 64–67. Bibcode:2015JPPA..298...64M. doi:10.1016/j.jphotochem.2014.10.019.
Mills, Andrew; Wells, Nathan (2015). "Indoor and outdoor monitoring of photocatalytic activity using a mobile phone app. and a photocatalytic activity indicator ink (paii)". Journal of Photochemistry and Photobiology A: Chemistry. 298: 64–67. Bibcode:2015JPPA..298...64M. doi:10.1016/j.jphotochem.2014.10.019.