| Journal Articles | Books | Conference Proceedings |
1 | Wong, L. T. Mui, K. W. Hui, P. S (2008) [7] | Hall and Greeno (2015) [17] | Baron B.T., Oliveira L.H., Comas F.N., Ota, I.R. (2018) [10] |
2 | Cheng, Yen and He (2008) [18] | Swaffield (2010) [2] | Daniel W.T. Chan, Leo K.C. Law and Eric S.W. Wong (2006) [12] |
3 | Cheng-Li, Cheng, Wen-Hung Lu, Ming-Der Shen (2005) [8] | Chardertton (2007) [19] | Swaffield, J. A. (2004) [14] |
4 | CL Cheng, CJ Yen, LT Wong KC Hoa (2008) [11] | Wise and Swaffield (2002) [20] | Wong, L. T. Mui, K.W. (2006) [4] |