@article{5970,
  author = {K. Dholakia and N. Simpson and M. Padgett and L. Allen},
  title = {Second-harmonic generation and the orbital angular momentum of light},
  year = {1996},
  journal = {Physical Review A},
  volume = {54},
  pages = {R3742 - R3745},
  month = {Jan-11-1996},
  issn = {1050-2947},
  url = {http://link.aps.org/doi/10.1103/PhysRevA.54.R3742},
  doi = {10.1103/PhysRevA.54.R3742},
}