AUTHOR :Heinonen, Juha.
           TITLE :Nonlinear potential theory of degenerate elliptic equations /
                  Juha Heinonen, Tero Kilpelainen, Olli Martio.
       PUBLISHER :Oxford ; New York : Clarendon Press ; Oxford ; New York :
                  Oxford University Press, 1993.
          SERIES :Oxford mathematical monographs ;                              
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