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