Take a look at these papers ,hope you will get one for research
http://www.sciencedirect.com/science/article/pii/S0030402615002661
http://www.ncbi.nlm.nih.gov/pubmed/25322426
http://www.sciencedirect.com/science/article/pii/S0030402614012790
http://www.ijesit.com/../IJESIT201406_62.pdf
http://onlinelibrary.wiley.com/doi/10.1002/mop.29114/abstract