TY  - RPRT
TI  - Trends and natural variability of North American spring onset as evaluated by a new gridded dataset of spring indices
AU  - Toby R. Ault
AU  - Mark D. Schwartz
AU  - Raul Zurita-Milla
AU  - Jake F. Weltzin
AU  - Julio L. Betancourt
PY  - 2015
DO  - 10.1175/jcli-d-14-00736.1
UR  - https://pubs.usgs.gov/publication/70186185
ID  - 70186185
ER  -