Luc Anselin and Oleg Smirnov. Efficient algorithms for constructing proper higher order spatial lag operators. Journal of Regional Science, 36(1):67–89, 1996. arXiv:, doi:10.1111/j.1467-9787.1996.tb01101.x.


Sergio J. Rey and Luc Anselin. PySAL: A Python Library of Spatial Analytical Methods. The Review of Regional Studies, 37(1):5–27, 2007.


D.J. Watts and S.H. Strogatz. Collective dynamics of 'small-world' networks. Nature, 393:440–442, 1998.