In Giraud's book "Cohomologie non-abelienne", the author repeatedly cites sources using something like [D blah]. E.g., Chapter 1, section 1, first line: "Nous renvoyons à [D 1] et à [SGA 1 VI]..."
The problem is there's nothing in the bibliography labelled [D]. The closest thing are two papers of Dedecker's. The first paper does not seem to be the right one, and the second one (published in "Lille"), my university doesn't seem to have access to.
What reference is he citing?