Redirect Notice
The previous page is sending you to
https://www.sciencedirect.com/science/article/pii/S0007153665800389/pdf?md5=620803c9e3a7bdf5b07b39b69641a9cc&pid=1-s2.0-S0007153665800389-main.pdf
.
If you do not want to visit that page, you can
return to the previous page
.