@article{11500,
  author = {E. Elst},
  title = {A table of Uesugi\textquoterights U- and V-functions for small values of optical thickness},
  year = {1968},
  journal = {Bulletin of the Astronomical Institutes of the Netherlands},
  volume = {20},
  chapter = {26},
  pages = {26-28},
  url = {http://adsabs.harvard.edu/full/1968BAN....20...26E},
  note = {JILA Pub. 312},
}