@article{7053,
  author = {V. Bujarrabal and J. Guibert and N. Rieu and A. Omont},
  title = {OH pumping by IR line overlap - Application to circumstellar masers},
  year = {1980},
  journal = {Astronomy and Astrophysics},
  volume = {84},
  pages = {311-316},
  url = {http://adsabs.harvard.edu/full/1980A\%26A....84..311B},
  note = {JILA Pub. 2153},
}