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@article {602, 
  author = {Jiaolong Chen and Antti Rasila and Xiantao Wang},
   title = {On lengths, areas and Lipschitz continuity of polyharmonic mappings},
    year = {2015},
 journal = {Journal of Mathematical Analysis and Applications},
   pages = {1196-1212},
    issn = {0022-247X},
  volume = {422},
  number = {2}
}