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- ^ Kiley, D. Driven:Inside BMW, the Most Admired Car Company in the World p.53; Wiley 2004 ISDN 0471269204
- ^ German Imperial Patent Office;patent no. 221388 issued on 10.12.1917
- ^ BMW Historical Archives; Bayerische Motoren Werke GmbH http://www.historicalarchive.bmw.com/2/index.php