@phdthesis{Hainich2015,
  author    = {Hainich, Rainer},
  title     = {The Wolf-Rayet stars of the nitrogen sequence in environments of different metallicities},
  school      = {Universit{\"a}t Potsdam},
  pages     = {161},
  year      = {2015},
  language  = {en}
}