you are touching an "open wound" or a huge gap here, therefore it is not really your fault if you did not hear or read a lot about Eastern fronts.
The best material is unpublished and rests in archives and collections.
Most German aviation historians do not contribute to WWI aviation history, especially the Eastern Fronts are a "white spot".
Russians have plenty of stuff but we are not so aware of their work (and the current political trend is probably not good for objective history writing).
Kurt Meindl did a lot for the Austrian side. Some English-speaking researchers contributed to this topic as well. You can find the topic "Russian front" covered in some articles published in "Over the Front" and other magazines by Germans, Russians, US-Americans and others.
However, in my humble opinion a real great reference work is missing here.
We all wait for Augie Blume´s book.
In general you can find reports about the fight on the Russian theatre of war mixed with other reports in the expensive and rare "standard literature" (Die gewöhnlichen Verdächtigen) like:
v. Eberhardt: Unsere Luftstreitkräfte 1914-1918.
Neumann: Die deutschen Luftstreitkräfte im Weltkriege.
As well some collections of reports or memoirs touch the topic Eastern front(s), e.g. Flieger am Feind, Chomton: Soldat in den Wolken etc.
Harry Redner and - many years ago - Schmalenbach did deal with military airships (includes Army and Navy air ships at the Eastern fronts).
Traditional history works of Heer and Marine (1920s/30s) cover the topic as well.