Pablo Rabanal Ismael Rodríguez Fernando Rubio Finding Minimum Spanning/Distances Trees by Using River Formation Dynamics. 60-71 2008 ANTS Conference http://dx.doi.org/10.1007/978-3-540-87527-7_6 conf/antsw/2008 db/conf/antsw/ants2008.html#RabanalRR08