Farrell, Phillip (3 August 2004). "rcp". earthsci.stanford.edu. Stanford University School of Earth, Energy & Environmental Sciences. Archived from the original on 2021-02-07. Retrieved 2018-03-06.
Farrell, Phillip (3 August 2004). "rcp". earthsci.stanford.edu. Stanford University School of Earth, Energy & Environmental Sciences. Archived from the original on 2021-02-07. Retrieved 2018-03-06.