@techreport{AchterbergKochTuchscherer2008, author = {Tobias Achterberg and Thorsten Koch and Andreas Tuchscherer}, title = {On the Effects of Minor Changes in Model Formulations}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {08-29}, language = {eng}, year = {2008} }