@book{WenyiTianbo2005,
  author    = {Wenyi, Chen and Tianbo, Wang},
  title     = {The hypoellipticity of differential forms on closed manifolds},
  series = {Preprint / Universit{\"a}t Potsdam, Institut f{\"u}r Mathematik, Arbeitsgruppe Partiell},
  journal   = {Preprint / Universit{\"a}t Potsdam, Institut f{\"u}r Mathematik, Arbeitsgruppe Partiell},
  publisher = {Univ.},
  address   = {Potsdam},
  issn      = {1437-739X},
  pages     = {11 S.},
  year      = {2005},
  language  = {en}
}