@article{imagepatchanalysisandclusteringof,
  title = {Image patch analysis and clustering of sunspots: a dimensionality reduction approach},
  author = {Kevin R. Moon and Jimmy J. Li and Veronique Delouille and Fraser Watson and Alfred O. Hero III},
  year = {2014},
  eprint = {1406.6390},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1406.6390v1},
}