A. L. Subramaniyan, S. L. Priya, M. Kottaisamy, and R. Ilangovan, “Investigations on the absorption spectrum of TiO2 nanofluid”, J. energy South. Afr., vol. 25, no. 4, pp. 123–127, Dec. 2014, doi: 10.17159/2413-3051/2014/v25i4a2245.