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@article {587, 
  author = {J. Chen and Antti Rasila and X. Wang},
   title = {Coefficient estimates and radii problems for certain classes of polyharmonic mappings},
    year = {2014},
 journal = {Complex Variables and Elliptic Equations},
    issn = {1747-6933 (Print), 1747-6941 (Online)},
   month = {July},
 mrclass = {30C45, 30C50},
  volume = {60},
  number = {3},
   pages = {354-371}
}