Modelling temporal and spatial features of collaboration network
  The collaboration network is an example of a social network which has both non-trivial temporal and spatial dependence. Based on the observations of collaborations in Physical Review Letters, a model of collaboration network is proposed which correctly reproduces the time evolution of the link length distributions, clustering coefficients, degree distributions and assortative property of real data to a large extent. 
Anjan Kumar Chandra, Kamalika Basu Hajra, Pratap Kumar Das and   Parongama Sen