@incollection{SchulzWelfens2004, author = {Schulz, Rolf and Welfens, Maria J.}, title = {KURS 21 - Schulen unternehmen Zukunft}, booktitle = {Jahrbuch {\"O}kologie 2005}, editor = {Altner, G{\"u}nter}, publisher = {Beck}, address = {M{\"u}nchen}, pages = {182 -- 188}, year = {2004}, language = {de} }