Cycles structure and local ordering in complex networks
  We study the properties of metrics aimed at the characterization of grid-like ordering in complex networks. These metrics are based on the global and local behavior of cycles of order four, which are the minimal structures able to identify rectangular clustering. The analysis of data from real networks reveals the ubiquitous presence of a high level of grid-like ordering that is non-trivially correlated with the local degree properties. These observations provide new insights on the hierarchical structure of complex networks. 
Guido Caldarelli (1), Romualdo Pastor-Satorras (2), and Alessandro   Vespignani (3) ((1)INFM UdR Roma1, (2)Departament de Fi...