Ulrik Brandes Markus Eiglsperger Michael Kaufmann Dorothea Wagner Sketch-Driven Orthogonal Graph Drawing. 1-11 2002 conf/gd/2002 Graph Drawing http://dx.doi.org/10.1007/3-540-36151-0_1 db/conf/gd/gd2002.html#BrandesEKW02