Fabian Lipp Alexander Wolff 0001 Johannes Zink 0001 Faster Force-Directed Graph Drawing with the Well-Separated Pair Decomposition. 52-59 2015 GD https://doi.org/10.1007/978-3-319-27261-0_5 conf/gd/2015 db/conf/gd/gd2015.html#LippWZ15