<bdi><a href="https://en.wikipedia.org/wiki/en:Heinrich_Hoffmann_(author)" class="extiw" title="w:en:Heinrich Hoffmann (author)"><span title="German psychiatrist and children's writer">Heinrich Hoffmann</span></a>
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<a rel="nofollow" class="external text" href="http://publikationen.ub.uni-frankfurt.de/volltexte/2006/103430/pdf/Struww.pdf">UB Frankfurt</a>