Clustering time series of sea   levels: extreme value approach
          Scotto, Manuel; Alonso, Andrés M.; Barbosa, Susana M.  
          
          Journal of Waterway, Port, Coastal, and Ocean Engineering, 136 (2010), 215-225  
          http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29WW.1943-5460.0000045  
           
            
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