@ARTICLE{Shadden05,
  author = {Shadden, S. C. and Lekien, F. and Marsden, J. E.},
  title = {Definition and properties of {Lagrangian} coherent structures from finite-time {Lyapunov} exponents in two-dimensional aperiodic flows},
  journal = {Physica D: Nonlinear Phenomena},
  year = {2005},
  volume = {212},
  pages = {271--304},
  number = {3-4},
  doi = {10.1016/j.physd.2005.10.007},
  publisher = {Elsevier}
}