Link to Full-Text Articles :

http://www.sciencedirect.com/science/article/pii/S1364032115001082

https://ideas.repec.org/a/eee/rensus/v46y2015icp51-61.html

http://umexpert.um.edu.my/file/publication/00003184_119411.pdf

http://ac.els-cdn.com/S1364032115001082/1-s2.0-S1364032115001082-main.pdf?_tid=65dd7c72-4010-11e5-

81f0-00000aacb362&acdnat=1439287667_fd1185b2ab9e86b9ec2df5d4a05bd963