[Antoine]

Just my two euro cents, I can only back up Juha comments about John Lunström's book, they're unavoidable concerning this particular subject, and in my view very near to be the definitive work on that campaign (If a definitive work exist).
History, technics, tactics, everything's there.
I've just checked at La maison du livre aviation in Paris, they still have the first volume, and I think that the second one can be obtained easily from amazon or abebook, for example.