Redirect Notice
The previous page is sending you to
https://www.sciencedirect.com/science/article/pii/S0007153666800451/pdf?md5=9eaeed2f32e790ceca502418d1d7017e&pid=1-s2.0-S0007153666800451-main.pdf
.
If you do not want to visit that page, you can
return to the previous page
.