Allen-Perkins, A., J. M. Pastor, E. Estrada. Two-walks assortativity of graphs and networks. arXiv:1704.03943 (2017).

Allen-Perkins, A., J. M. Pastor, E. Estrada. Two-walks assortativity of graphs and networks. Applied Mathematics and Computation, 311, 2017, 262-271. [PDF]