<h1>&nbsp;</h1> <div class="toc-about clearfix"> </div><!-- class="about clearfix" --> <div id="mysitesnoframes" class="sites_content"><ul> <li><a rel="nofollow" href="https://www.sciencedirect.com/science/article/abs/pii/S0301051107001202" ><img src="http://www.google.com/s2/favicons?domain=sciencedirect.com" width="32" height="32" /><strong>Sciencedirect.com</strong>sciencedirect.com</a></li> <li><a rel="nofollow" href="https://www.tandfonline.com/doi/abs/10.1080/13594320500513913" ><img src="http://www.google.com/s2/favicons?domain=tandfonline.com" width="32" height="32" /><strong>Tandfonline.com</strong>tandfonline.com</a></li> <li><a rel="nofollow" href="https://www.sciencedirect.com/science/article/abs/pii/S1364661310002524" ><img src="http://www.google.com/s2/favicons?domain=sciencedirect.com" width="32" height="32" /><strong>Sciencedirect.com</strong>sciencedirect.com</a></li> <li><a rel="nofollow" href="https://www.sciencedirect.com/science/article/abs/pii/S0006322303001689" ><img src="http://www.google.com/s2/favicons?domain=sciencedirect.com" width="32" height="32" /><strong>Sciencedirect.com</strong>sciencedirect.com</a></li> </ul></div> Your browser does not handle frames, which are required to view the sites in tabs. Please upgrade to a more modern browser.<br /><br />