4IPCC. Sunmary for policym akers of climate change 2007: The physical science basis[C~// Co ntribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge: Cambr idge University Press, 2007.
6A. Serrano , V. L . Ma teos and ] . A. Garcia , Tren d Analysis of Monthly precipi tation Over the Iberian Pen in sula for the Period 1921 - 1995 ;Phys. Chem. Earth (B) , 1999 , 24( 1- 2) : 85- 90.
