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<a href="https://en.wikisource.org/wiki/de:J._J._Tanner" class="extiw" title="s:de:J. J. Tanner">J. J. Tanner</a></div>
<a rel="nofollow" class="external text" href="http://digital.ub.uni-duesseldorf.de/content/titleinfo/162861">Heinrich Heine Universität Düsseldorf</a>