The previous page is sending you to http://www.sciencedirect.com/science/article/pii/S0194659598900612/pdf?md5=9179e020458d907fd7c7617e81bdce88&pid=1-s2.0-S0194659598900612-main.pdf&_valck=1.

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