https://mappingthelives.org/bio/2125a2dc-c65d-4dbf-b36d-f1570100753f?language=en
https://crt-ii.org/_awards/_apdfs/Fleischhacker_Oskar.pdf
https://online-ofb.de/famreport.php?ofb=juden_nw&ID=I315683&nachname=FLEISCHHACKER&lang=en