Emilio Di Giacomo Walter Didimo Giuseppe Liotta Henk Meijer Drawing a Tree as a Minimum Spanning Tree Approximation. 61-72 2010 ISAAC (2) http://dx.doi.org/10.1007/978-3-642-17514-5_6 conf/isaac/2010-2 db/conf/isaac/isaac2010-2.html#GiacomoDLM10