Sousa, P. M. y Trigo, R. M. y Aizpurua, P. y Nieto, R. y Gimeno, L. y GarcĂ­a Herrera, Ricardo (2011) Trends and extremes of drought indices throughout the 20th century in the Mediterranean. Natural hazards and earth system sciences, 11 (1). pp. 33-51. ISSN 1561-8633