@inbook{4743,
  author = {David Hummer},
  title = {The Opacity Project and the Practical Utilization of Atomic Data},
  year = {1991},
  volume = {341},
  number = {NATO ASI Series},
  pages = {431-439},
  publisher = {Springer Netherlands},
  address = {Dordrecht},
  isbn = {978-94-010-5574-1},
  doi = {10.1007/978-94-011-3554-2_41},
}