TY  - JOUR
A1  - Petsche, Hans-Joachim
T1  - It began with Pestalozzi and Schleiermacher : Reflections on the polymath Hermann Grassmann (1809 - 1877)
Y1  - 2010
UR  - http://www.ems-ph.org/journals/newsletter/pdf/2010-06-76.pdf
SN  - 1027-488x
ER  -