Balling, R.C., Jr., Skindlov, J.A. and Phillips, D.H., The impact of increasing summer mean temperatures on
extreme maximum and minimum temperatures in Phoenix, Arizona. Journal of Climate, 3:1491--1494, 1990.Gilleland, Eric, Katz, Richard W. and Young, Greg. Tutorial for the 'Extremes Toolkit: Weather and Climate
Applications of Extreme Value Statistics.' http://www.assessment.ucar.edu/toolkit, 2005.
Tarleton, Lesley F. and Katz, Richard W., Statistical explanation for trends in extreme summer temperatures
at Phoenix, A.Z., Journal of Climate, 8 (6):1704--1708, 1995.