The previous page is sending you to https://www.sciencedirect.com/science/article/pii/S0953756208612885/pdf?md5=2f80ec907d86acb01a22a620db82c61a&pid=1-s2.0-S0953756208612885-main.pdf&_valck=1.

 If you do not want to visit that page, you can return to the previous page.