@article{SigmanHainHaug2010,
  author    = {Daniel M. Sigman and Mathis P. Hain and Gerald H. Haug},
  title     = {The polar ocean and glacial cycles in atmospheric CO2 concentration},
  doi       = {10.1038/Nature09149},
  url       = {http://www.nature.com/nature/},
  year      = {2010},
}