Hermann Graßmann. Biography By Hans-Joachim Petsche. Translated by Mark Minnes. Basel (Birkhäuser). 2009. ISBN 978-3-7643-8859-1. xx + 306 pp. No price stated.Hermann Graßmann. Roots and Traces. Autographs and Unknown Documents Edited by Hans-Joachim Petsche, Lloyd Kannenberg, Gottfried Keßler and Jolanta Liskowacka. Basel (Birkhäuser). 2009. ISBN 978-3-0346-0154-2. xi + 256 pp. No price stated.
Article in Historia Mathematica (November 2010)