@article{RNTI/papers/1001878,
  author    = {Lynne Billard and J. Le-Rademacher},
  title     = {Symbolic Principal Components for Interval-Valued Data},
  journal = {Revue des Nouvelles Technologies de l'Information},
  volume = {Advances in Theory and Applications of High Dimensional and Symbolic Data Analysis, RNTI-E-25},
  year      = {2013},
  pages     = {31-39}
}