1. Obiukwu Osita1, Opara Ignatius b, Udeani, International Journal of Engineering and Technologies pp. 2297–623X, Vol. 7, pp 68–77(2017).
2. J.B. Sajin, R.Sivasubramanian, International Journal of Advanced Engineering Technology pp. 0976–3945(2016).
3. Ing Kong, Jack Ting Bick Shang and Kim YeowTshai, ARPN Journal of Engineering and Applied Sciences, pp. 1819–6608(2016).
4. Nechwatel A, Mieck K, Composite Science and Technology, pp. 63:1273–1279(2003).
5. Senthilnathan D, GnanavelBabu A, Bhaskar G. B, International Journal of Engineering and Technology, pp. 0975–4024, Vol 6 No 1(2014).