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.