Redirect Notice
The previous page is sending you to
https://www.sciencedirect.com/science/article/pii/S0007153668801366/pdf?md5=820d56151515f3804a8044e0d438c95d&pid=1-s2.0-S0007153668801366-main.pdf&_valck=1
.
If you do not want to visit that page, you can
return to the previous page
.