The volume on verum focus called "Wahrheit - Fokus - Negation" mentioned in the previous post has arrived. It contains six articles by Hardarik Blühdorn, Horst Lohnstein,Hildegard Stommel, Stefan Sudhof and myself, entirely on verum focus and its relation to truth and negation. Here is the publisher's info page. A manuscript version of my contribution can still be found here.