Modular scale-free networks We denote by Hg the network model after g iterations k For g>l Ha can be obtained from Ha-1 by adding M-1 replicas of Ho-1 with their external nodes being linked to the hub of original ng-z unit. w The new hub is the hub of original Ha-junit. s The new external nodes are composed of all the peripheral nodes of M-1 copies of Hg-1 We denote by Hg the network model after g iterations.  For g>1,  Hg can be obtained from Hg-1 by adding M-1 replicas of Hg-1 with their external nodes being linked to the hub of original Hg-1 unit.  The new hub is the hub of original Hg-1 unit.  The new external nodes are composed of all the peripheral nodes of M-1 copies of Hg-1. Modular scale-free networks 20:19:48