Redirect Notice
 The previous page is sending you to https://www.sciencedirect.com/science/article/pii/S0167299106811195/pdf?md5=eb784926ca59f1310a3ef37cec9bb76c&pid=1-s2.0-S0167299106811195-main.pdf&_valck=1.

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