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<h1> </h1> <div class="toc-about clearfix"> </div> <div id="mysitesnoframes" class="sites_content"><ul> <li><a rel="nofollow" href="https://link.springer.com/article/10.1007%252FBF02229679" ><img src="http://www.google.com/s2/favicons?domain=link.springer.com" width="32" height="32" /><strong>Link.springer.com</strong>link.springer.com</a></li> <li><a rel="nofollow" href="https://www.sciencedirect.com/science/article/abs/pii/S0887618598000024" ><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/10.1080/10615800008549263" ><img src="http://www.google.com/s2/favicons?domain=tandfonline.com" width="32" height="32" /><strong>Tandfonline.com</strong>tandfonline.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 />

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