On the influence of rings on orbital velocities
  We analyze the possible effect of rings on orbital velocities in galaxies.
The superposition of the central force with the gravitational forces induced by
the rings opens up various possibilities of the course of orbital velocities.
The orbital velocity depends on the position of the star in the ring. We
illustrate this dependence on several models, where we show the course of
potential curves and the curves of field strength.
