I. Hilal, H. l. Abdullah, and A. M. Ibraheem , Trans., “Effect of Aluminum Oxide Nanoparticles Films Thickness on Optical Properties”, int.jour.sci.res.mana, vol. 6, no. 11, pp. EC–2018, Nov. 2018, doi: 10.18535/ijsrm/v6i11.ec02.