@article{principalmanifoldsandnonlineardimension,
  title = {Principal Manifolds and Nonlinear Dimension Reduction via Local Tangent Space Alignment},
  author = {Zhenyue Zhang and Hongyuan Zha},
  year = {2002},
  eprint = {cs/0212008},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/cs/0212008v1},
}