This appears to be the source of the main study in the article. http://www.sciencedirect.com/science/article/pii/S0160289615001233 http://www.sciencedirect.com/

This appears to be the source of the main study in the article. http://www.sciencedirect.com/science/article/pii/S0160289615001233 http://www.sciencedirect.com/science/article/pii/S0160289615...