TY  - RPRT
TI  - Northern Hemisphere modes of variability and the timing of spring in western North America
AU  - T.R. Ault
AU  - A.K. Macalady
AU  - G.T. Pederson
AU  - J.L. Betancourt
AU  - M.D. Schwartz
PY  - 2011
DO  - 10.1175/2011jcli4069.1
UR  - https://pubs.usgs.gov/publication/70036963
ID  - 70036963
ER  -