@article{GSH2008,
   abstract = {We investigate the existence and linear stability of coupled vortex solitons supported by cascaded four-wave mixing in a Raman active medium excited away from the resonance. We present a detailed analysis for the two-and three-component vortex solitons and demonstrate the formation of stable and unstable vortex solitons, and associated spatiotemporal helical beams, under the conditions of the simultaneous frequency and vortex comb generation.},
   author = {A V Gorbach and D V Skryabin and C N Harvey},
   doi = {10.1103/PhysRevA.77.063810},
   issn = {1050-2947},
   issue = {6},
   journal = {PHYSICAL REVIEW A},
   month = {6},
   title = {Vortex solitons in an off-resonant Raman medium},
   volume = {77},
   year = {2008}
}