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I apologize if this is obvious, but what is a D.F. manuscript? See this link for an example of the term's use.

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    I'm voting to close this question as off-topic because it is based on a transparent error, and therefore unlikely to help anyone else. – Chris Sunami supports Monica Dec 8 '17 at 17:43
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D.F. are the initials of one of the authors (Steiner). ;-)

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