The previous page is sending you to https://www.sciencedirect.com/science/article/pii/S0007153665800298/pdf?md5=d176d8137d2c3d6c1f245adfb62753d0&pid=1-s2.0-S0007153665800298-main.pdf&_valck=1.

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