@article{statisticalestimationandclusteringof,
  title = {Statistical Estimation and Clustering of Group-invariant Orientation Parameters},
  author = {Yu-Hui Chen and Dennis Wei and Gregory Newstadt and Marc DeGraef and Jeffrey Simmons and Alfred Hero},
  year = {2015},
  eprint = {1503.04474},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1503.04474v2},
}