This document is unfortunately not available for download at the moment.
Steve Russ , Jörg Liesen (2011) From Past to Future: Graßmann's Work in Context: Graßmann Bicentennial Conference, September 2009, Dordrecht, Springer.
Life history of Robert Grassmann, written by himself (1890)
Jörg Liesen , Steve Russ
pp. 9-16
Not implemented yet !