Overy, Why the Allies Won, 120-122; Boog, ‘The Strategie Air War’, 54-76.
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Overy, Why the Allies Won, 122-125; Boog, ‘The Strategie Air War’, 76-88, for a discussion of the crisis in the bombing campaign in 1943; там же, 159-256 for the changing fortunes of German air defences.