Trends in ozone concentrations in the Iberian Peninsula by quantile regression and clustering
          Monteiro, Alexandra ; Carvalho, Anabela; Ribeiro, Isabel; Scotto, Manuel; Barbosa, Susana M.; Baldasano, José Maria; Pay, Maria Teresa; Miranda, Ana Isabel; Borrego, Carlos   
          
          Atmospheric Environment, 56 (2012), 184-193  
          http://www.sciencedirect.com/science/article/pii/S135223101200310X  
           
            
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