@article{HamannGraefenerLiermann2006,
  author    = {Wolf-Rainer Hamann and G. Graefener and A. Liermann},
  title     = {The galactic WN stars - Spectral analyses with line-blanketed model atmospheres versus stellar evolution models with and without rotation},
  journal   = {Astronomy and astrophysics : an international weekly journal},
  volume    = {457},
  number    = {3},
  pages     = {1015 -- 1031},
  doi       = {10.1051/0004-6361:20065052},
  year      = {2006},
}