8[1]Jones P D, T J Osbom, K R Briffa et al. Adjusting for sampling density in grid box land and ocean surface temperature time series. J. Geophys. Res., 2001, 106: 3371-3380.
9[2]Peterson T C, R S Vose. An overview of the global historical climatology network temperature data base. Bull. Am.Met. Soc., 1997, 78: 2837-2849.
10[3]Hansen J, R Ruedy, J Glascoe et al. GISS analysis of surface temperature change. J. Geophys. Res., 1999, 104(D24):30997-31022.