=ADD= =author= Mutzel; Petra =title= An Alternative Method to Crossing Minimization on Hierarchical Graphs =year= 1997 =institution= Max-Plank-Institut fuer Informatik =number= MPI-I-97-1-008 =month= 03 =reftype= 11 =source= 3 =ADD= =author= =title= =year= =institution= Max-Plank-Institut fuer Informatik =number= =month= =reftype= 11 =source= 3 =ADD= =author= =title= =year= =institution= Max-Plank-Institut fuer Informatik =number= =month= =reftype= 11 =source= 3 =ADD= =author= =title= =year= =institution= Max-Plank-Institut fuer Informatik =number= =month= =reftype= 11 =source= 3 =ADD= =author= =title= =year= =institution= Max-Plank-Institut fuer Informatik =number= =month= =reftype= 11 =source= 3 =ADD= =author= =title= =year= =institution= Max-Plank-Institut fuer Informatik =number= =month= =reftype= 11 =source= 3 =ADD= =author= =title= =year= =institution= Max-Plank-Institut fuer Informatik =number= =month= =reftype= 11 =source= 3 =ADD= =author= =title= =year= =institution= Max-Plank-Institut fuer Informatik =number= =month= =reftype= 11 =source= 3