14 books • 4 series
Manual of Mercantile Correspondence, Vol. 2: In Two Languages English and German (Classic Reprint)
Manual of Mercantile Correspondence in Two Languages - English and German, in Two Volumes, Vol. II
Geopolitical Change, Grand Strategy and European Security (The European Union in International Affairs)
Theorems on Regularity and Singularity of Energy Minimizing Maps (Lectures in Mathematics Eth Zurich)