@article{eprints1128,
          number = {3},
         journal = {Physical Review E},
       publisher = {American Physical Society},
           month = {March},
          author = {Guido Caldarelli and C{\'e}cile  Caretta Cartozo and Paolo De Los Rios and Vito D. P. Servedio},
          volume = {69},
            year = {2004},
           title = {Widespread occurrence of the inverse square distribution in social sciences and taxonomy},
        abstract = {The widespread occurrence of an inverse square relation in the hierarchical distribution of subcommunities within communities (or subspecies within species) has been recently invoked as a signature of hierarchical self-organization within social and ecological systems. Here we show that, whether such systems are self-organized or not, this behavior is the consequence of the treelike classification method. Different treelike classifications (both of real and truly random systems) display a similar statistical behavior when considering the sizes of their sub-branches.},
        keywords = {PACS: 89.75.Fb, 89.75.Hc, 05.40.-a, 05.65.+b},
             url = {http://eprints.imtlucca.it/1128/}
}