@article{LiermannHamannOskinova2012,
  author    = {A. Liermann and Wolf-Rainer Hamann and Lida Oskinova},
  title     = {The Quintuplet cluster III. Hertzsprung-Russell diagram and cluster age},
  journal   = {Astronomy and astrophysics : an international weekly journal},
  volume    = {540},
  doi       = {10.1051/0004-6361/201117534},
  year      = {2012},
}