BUCHER, Eugen / WIEGAND, Wolfgang

1991. Übungen im Obligationenrecht [Case exercises in the Law of Obligations - in German], Zürich: Schulthess, 2d ed. (1991) 202 p. [59 (Fall 3): CISG Arts. 71-73; 169-178 (Fall 11): CISG Art. 67(1)]