Redirect Notice
The previous page is sending you to
https://www.sciencedirect.com/science/article/pii/S0007153685800115/pdf?md5=eb42b515a0ccb0d4588b836212dea08b&pid=1-s2.0-S0007153685800115-main.pdf
.
If you do not want to visit that page, you can
return to the previous page
.