Edge Union of Networks on the Same Vertex Set
  Random networks generators like Erdoes-Renyi, Watts-Strogatz and Barabasi-Albert models are used as models to study real-world networks. Let G^1(V,E_1) and G^2(V,E_2) be two such networks on the same vertex set V. This paper studies the degree distribution and cluster coefficient of the resultant networks, G(V, E_1 U E_2). 
Chuan Wen, Loe and Henrik Jeldtoft Jensen
physics.soc-ph cond-mat.stat-mech cs.SI