Robert und Hermann Grassmann’s Influence on the History of Formal Logic (Videomitschnitt des Vortrags)
V. Peckhaus, in: H.-J. Petsche, P. Lenke (Eds.), International Grassmann Conference. Hermann Grassmann Bicentennial: Potsdam and Szczecin, 16–19 September 2009. Video Recording of the Conference, Universitätsverlag, Potsdam, 2010.