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The article is largely sourced to Schumann:

• Schumann, Ralf (2014). Ritterkreuzträger Profile Nr. 13 Rudolf Frank — Eichenlaubträger der Nachtjagd (in German). UNITEC-Medienvertrieb. OCLC  883388135. ASIN  B00JQ4TPDO  (16 June 2014). {{ cite book}}: Unknown parameter |trans_title= ignored (|trans-title= suggested) ( help)

This is a "Ritterkreuzträger Profile" -- a WP:QS booklet, which comes from an author who's also been published in an extremist publisher VDM Heinz Nickel. Given the nature of the source, the level of detail in the article is WP:UNDUE. I tagged the article accordingly. K.e.coffman ( talk) 08:08, 4 June 2017 (UTC)

• Started a discussion at Wikipedia:Reliable sources/Noticeboard#UNITEC-Medienvertrieb AIRcorn  (talk) 20:07, 2 April 2018 (UTC)