@article{11225,
  author = {O. Bely and D. Petrini},
  title = {The excitation cross section Q(4s -> 3d) in Ca II},
  year = {1966},
  journal = {Physics Letters},
  volume = {23},
  pages = {442-443},
  month = {1966-11},
  issn = {00319163},
  url = {http://linkinghub.elsevier.com/retrieve/pii/0031916366910845},
  doi = {10.1016/0031-9163(66)91084-5},
}