  Large scale numerical simulations of the Gross-Pitaevskii equation are used
to elucidate the self-evolution of a Bose gas from a strongly non-equilibrium
initial state. The stages of the process confirm and refine the theoretical
scenario of Bose-Einstein condensation developed by Svistunov, Kagan, and
Shlyapnikov [1-3]: the system evolves from the regime of weak turbulence to
superfluid turbulence, via states of strong turbulence in the long-wavelength
region of energy space.
