@article{cai2013spatial,
  title={Spatial outlier detection based on iterative self-organizing learning model},
  author={Cai, Qiao and He, Haibo and Man, Hong},
  journal={Neurocomputing},
  volume={117},
  pages={161--172},
  year={2013},
  publisher={Elsevier}
}



if using the clusterPy library for generating SOM

@Manual{ClusterPy,
title = {ClusterPy: {Library} of spatially constrained clustering algorithms, {Version} 0.9.9.},
author = {Juan C. Duque and Boris Dev and Alejandro Betancourt and Jose L. Franco},
organization = {RiSE-group (Research in Spatial Economics). EAFIT University.},
address = {Colombia},
year = {2011},
url = {http://www.rise-group.org},
}