@inproceedings{generalizinganalyticshrinkageforarbitrar,
  title = {Generalizing Analytic Shrinkage for Arbitrary Covariance Structures},
  author = {Daniel Bartz and Klaus-Robert Müller},
  year = {2013},
  booktitle = {NeurIPS 2013 12},
  url = {http://papers.nips.cc/paper/4921-generalizing-analytic-shrinkage-for-arbitrary-covariance-structures},
}