Redirect Notice
The previous page is sending you to
https://www.sciencedirect.com/science/article/pii/0305197892900248/pdf?md5=dfa1e31985e90aea2a813da62c99fcc6&pid=1-s2.0-0305197892900248-main.pdf
.
If you do not want to visit that page, you can
return to the previous page
.