@techreport{BorndoerferHeismann2012, author = {Ralf Bornd{\"o}rfer and Olga Heismann}, title = {Minimum Cost Hyperassignments with Applications to ICE/IC Rotation Planning}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {11-46}, language = {eng}, year = {2012} }