Nicolas Labroche Christiane Guinot Gilles Venturini Fast Unsupervised Clustering with Artificial Ants. 1143-1152 http://dx.doi.org/10.1007/978-3-540-30217-9_115 2004 conf/ppsn/2004 PPSN db/conf/ppsn/ppsn2004.html#LabrocheGV04