Friesoythe
August Wöhrmann, "Die Kämpfe 1945 in und um Friesoythe," IN Friesoythe 25 Jahre danach: 1945-1970 (Friesoythe: Stadt Friesoythe, 1970) 8-29. Wöhrmann was the first to make a serious examination of the issue, and this work is a ground-breaking study of great value which identifies many of the relevant sources.  Unfortunately Wöhrmann, a former soldier  himself, reports he was unable to make any contact with the German paratroopers who defended Friesoythe.