@inproceedings{variationalgaussianprocessfactoranalysis,
  title = {Variational Gaussian-process factor analysis for modeling spatio-temporal data},
  author = {Jaakko Luttinen and Alexander Ilin},
  year = {2009},
  booktitle = {NeurIPS 2009 12},
  url = {http://papers.nips.cc/paper/3805-variational-gaussian-process-factor-analysis-for-modeling-spatio-temporal-data},
}