Writing an academic paper? Try Fidus Writer: 
The Fidus Writer online editor is especially for academics who need to write papers in collaboration with other authors, and it includes special tools for managing citations, formulas, and bibliographies. If you’re writing an academic paper by yourself, you have a lot of choices for tools to edit your document. Some of them even take care of making your footnotes and bibliographies come out in the right format. But writing collaboratively is harder, for lots of reasons.
read more: Opensource.com druthb
Supporting Open Source.
Have you tried: Farking?