Search.proquest.com + Infona.pl

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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://search.proquest.com/openview/a204fbc39f3a655837ab3ea0ae1d4e65/1?pq-origsite=gscholar&cbl=42182" ><img src="http://www.google.com/s2/favicons?domain=search.proquest.com" width="32" height="32" /><strong>Search.proquest.com</strong>search.proquest.com</a></li> <li><a rel="nofollow" href="https://www.infona.pl/resource/bwmeta1.element.elsevier-2e04f2b4-2ca0-3199-a06f-c2b860f5901c" ><img src="http://www.google.com/s2/favicons?domain=infona.pl" width="32" height="32" /><strong>Infona.pl</strong>infona.pl</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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