@misc{indiciae7ae6f8e5efb1,
  title = {Northern Hemisphere modes of variability and the timing of spring in western North America},
  author = {T.R. Ault and A.K. Macalady and G.T. Pederson and J.L. Betancourt and M.D. Schwartz},
  year = {2011},
  doi = {10.1175/2011jcli4069.1},
  url = {https://pubs.usgs.gov/publication/70036963},
  note = {Source identifier: 70036963}
}