@incollection{Hofstedt2013, author = {Petra Hofstedt}, title = {Constraints}, booktitle = {Handbuch der K{\"u}nstlichen Intelligenz}, edition = {5. korrigierte Auflage}, editor = {G{\"u}nther G{\"o}rz and Josef Schneeberger and U. Schmid}, isbn = {978-3-486-71307-7}, year = {2013}, }