Redirect Notice
The previous page is sending you to
https://www.sciencedirect.com/science/article/pii/S0007153662800722/pdf?md5=d85ef41acae09093fa49edd28172aefe&pid=1-s2.0-S0007153662800722-main.pdf&_valck=1
.
If you do not want to visit that page, you can
return to the previous page
.