@article{Arvieu:1997,
  author  = "R. Arvieu and P. Rozmej and W. Berej",
  title   = "Time-dependent partial waves and vortex rings in the dynamics of wavepackets",
  journal = "Journal of Physics A : Mathematical and General",
  volume  = "Vol. 30",
  pages   = "5381--5392",
  year    = "1997",
}