Hamzah, N. ., Ghodgaonkar, D. K. ., Che Kasim, K. F. . and Awang, Z. . (2005) “Microwave Non-Destructive Testing of Coatings and Paints Using Free Space Microwave Measurement”, Scientific Research Journal, 2(2), pp. 17–23. doi: 10.24191/srj.v2i2.9329.