2007
Betancourt, Julio L., Mark D. Schwartz, David D. Breshears, Carol A. Brewer, Gary Frazer, John E. Gross, Susan J. Mazer, Bradley C. Reed, and Bruce E. Wilson. "
Evolving plans for the USA National Phenology Network."
Eos, Transactions American Geophysical Union 88 (2007): 211.
]