Solutions of the Gross-Pitaevskii equation in two dimensions
  In two dimensions the Gross-Pitaevskii equation for a cold, dilute gas of bosons has an energy dependent coupling parameter describing particle interactions. We present numerical solutions of this equation for bosons in harmonic traps and show that the results can be quite sensitive to the precise form of the coupling parameter that is used. 
M. D. Lee and S. A. Morgan