Solitons in nonlocal nonlinear media: exact results
  We investigate the propagation of one-dimensional bright and dark spatial solitons in a nonlocal Kerr-like media, in which the nonlocality is of general form. We find an exact analytical solution to the nonlinear propagation equation in the case of weak nonlocality. We study the properties of these solitons and show their stability. 
Wieslaw Krolikowski and Ole Bang