@techreport{AchterbergGroetschelKoch2006, author = {Tobias Achterberg and Martin Gr{\"o}tschel and Thorsten Koch}, title = {Software for Teaching Modeling of Integer Programming Problems}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {06-23}, language = {eng}, year = {2006} }