@article{DongesDonnerTrauthetal.2011,
  author    = {Jonathan Friedemann Donges and Reik Volker Donner and Martin H. Trauth and Norbert Marwan and Hans Joachim Schellnhuber and J{\"u}rgen Kurths},
  title     = {Nonlinear detection of paleoclimate-variability transitions possibly related to human evolution},
  journal   = {Proceedings of the National Academy of Sciences of the United States of America},
  volume    = {108},
  number    = {51},
  pages     = {20422 -- 20427},
  doi       = {10.1073/pnas.1117052108},
  year      = {2011},
}