Redirect Notice
The previous page is sending you to
http://www.sciencedirect.com/science/article/pii/S0007153686801620/pdf?md5=c59a143d34f7312e79b6e2d2044476d2&pid=1-s2.0-S0007153686801620-main.pdf
.
If you do not want to visit that page, you can
return to the previous page
.