Redirect Notice
The previous page is sending you to
https://www.sciencedirect.com/science/article/pii/0169534787901662/pdf?md5=466fb1ca77066f5381d7123a39b6db93&pid=1-s2.0-0169534787901662-main.pdf
.
If you do not want to visit that page, you can
return to the previous page
.