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Using the numerical solution of the nonlinear Schr\"odinger equation and avariational method it is shown that (3+1)-dimensional spatiotemporal opticalsolitons, known as light bullets, can be stabilized in a layered Kerr mediumwith sign-changing nonlinearity along the propagation direction.Comment: 4 pages, 3 PS figure

Stabilization of a light bullet in a layered Kerr medium with sign-changing nonlinearity