@article{ Ren:2005:Natural,
  author = "Liu Ren and Alton Patrick and Alexei A. Efros and Jessica K. Hodgins and James M. Rehg",
  title = "A Data-Driven Approach to Quantifying Natural Human Motion",
  year = "2005",
  month = aug,
  journal = "ACM Transactions on Graphics (SIGGRAPH 2005)",
  volume = "24",
  number = "3",
  pages = "1090--1097",
}