Three-dimensional spatiotemporal optical solitons in nonlocal nonlinear   media
  We demonstrate the existence of stable three-dimensional spatiotemporal solitons (STSs) in media with a nonlocal cubic nonlinearity. Fundamental (nonspinning) STSs forming one-parameter families are stable if their propagation constant exceeds a certain critical value, that is inversely proportional to the range of nonlocality of nonlinear response. All spinning three-dimensional STSs are found to be unstable. 
D. Mihalache, D. Mazilu, F. Lederer, B. A. Malomed, Y. V. Kartashov,   L.-C. Crasovan, L. Torner