@article{6485,
  author = {A. Mamaev and M. Saffman and A. Zozulya},
  title = {Time-dependent evolution of an optical vortex in photorefractive media},
  year = {1997},
  journal = {Physical Review A},
  volume = {56},
  pages = {R1713 - R1716},
  month = {Jan-09-1997},
  issn = {1050-2947},
  url = {http://link.aps.org/doi/10.1103/PhysRevA.56.R1713},
  doi = {10.1103/PhysRevA.56.R1713},
}