https://de.wikipedia.org/wiki/Wolfgang_Grenke#:~:text=Wolfgang%20Grenke%20(*%203.%20F ebruar,%2DW%C3%BCrttembergischen%20Industrie%2D%20und%20Handelskammertags.
https://www.fool.de/2020/09/18/was-ist-dran-am-absturz-der-und-den-vorwuerfen-gegen-die-g renke-aktie/?rss_use_excerpt=1
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