Redirect Notice
 The previous page is sending you to https://www.sciencedirect.com/science/article/pii/S0723202011801402/pdf?md5=7c6466030c128d239c71ec41923b160f&pid=1-s2.0-S0723202011801402-main.pdf.

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