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R. H. Enns and S. S. Rangnekar, "Bistable spheroidal optical solitons," Physical Review A. 45, 3354 (1992).

The possible forms the intensity dependence of the nonlinear refractive index would have to take for bistable light bullets to exist are examined. Bistable light bullets are propagating spheroidal optical solitons characterized by different sizes and intensity profiles but with the same energy.

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