Balaraju NJ, Ezhilselvi V, Meenu S, Manikandanath NT, Ganesh Murugasen Shanmugavel R, Shirish SK, Nagacharan VK, CM Manjunatha, Development and certification of chromic acid-free anodizing process for aircraft grade aluminium alloys, Indian Journal of Engineering & Materials Sciences, Vol. 28, 2021, pp. 21-27.
http://nopr.niscair.res.in/handle/123456789/57345