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Steve Russ , Jörg Liesen (2011) From Past to Future: Graßmann's Work in Context: Graßmann Bicentennial Conference, September 2009, Dordrecht, Springer.
Description of the life of Hermann Grassmann by his son Justus Grassmann, probably written shortly after the death of his father, 1877
Jörg Liesen , Steve Russ
pp. 3-8