@article{GroetschelKrumkeRambauetal.2002, author = {Martin Gr{\"o}tschel and Sven Krumke and J{\"o}rg Rambau and Luis Miguel Torres}, title = {Making the Yellow Angels Fly}, journal = {SIAM News}, volume = {35}, number = {4}, pages = {1,10,11}, year = {2002}, }