@article{HamannKoesterkeWesselowski1995,
  author    = {Hamann, Wolf-Rainer and Koesterke, Lars and Wesselowski, U.},
  title     = {Spectral analyses of the galactic Wolf-Rayet stars : hydrogen-helium abundances and improved stellar parameters for the WN class},
  year      = {1995},
  language  = {en}
}
@article{HamannKoesterkeWesselowski1995,
  author    = {Hamann, Wolf-Rainer and Koesterke, Lars and Wesselowski, U.},
  title     = {Spectral atlas of galactic Wolf-Rayet stars (WN-sequence)},
  year      = {1995},
  language  = {en}
}