Redirect Notice
The previous page is sending you to
https://www.sciencedirect.com/science/article/pii/S0007153674800458/pdf?md5=d4d0c2a7c73182f23562eb9baafd547e&pid=1-s2.0-S0007153674800458-main.pdf
.
If you do not want to visit that page, you can
return to the previous page
.