@article{BurgemeisterGvaramadzeStringfellowetal.2013,
  author    = {S. Burgemeister and Visily V. Gvaramadze and G. S. Stringfellow and Alexei Y. Kniazev and Helge Tobias Todt and Wolf-Rainer Hamann},
  title     = {WR 120bb and WR 120bc: a pair of WN9h stars with possibly interacting circumstellar shells},
  journal   = {Monthly notices of the Royal Astronomical Society},
  volume    = {429},
  number    = {4},
  pages     = {3305 -- 3315},
  doi       = {10.1093/mnras/sts588},
  year      = {2013},
}