@article{10_4064_ap103_1_6,
     author = {Sh. Chen and S. Ponnusamy and X. Wang},
     title = {Landau's theorem for
  $p$-harmonic mappings in several  variables},
     journal = {Annales Polonici Mathematici},
     pages = {67--87},
     publisher = {mathdoc},
     volume = {103},
     number = {1},
     year = {2012},
     doi = {10.4064/ap103-1-6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap103-1-6/}
}