Friedländer, The Years of Extermination, 109-116; Longerich, Politik, 435. For the camps, see Regina M. Delacor, ‘From Potential Friends to Potential Enemies: The Internment of “Hostile Foreigners” in France at the Beginning of the Second World War', Journal of Contemporary History, 35 (2000), 361-368; more generally, on the occupied zone, Philippe Burrin, France under the Germans: Collaboration and Compromise (New York, 1996).