@techreport{BorndoerferDaneckerWeiser2020, author = {Ralf Bornd{\"o}rfer and Fabian Danecker and Martin Weiser}, title = {A Discrete-Continuous Algorithm for Free Flight Planning}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {20-33}, language = {eng}, year = {2020} }