  Multiple-spiral-wave solutions of the general cubic complex Ginzburg-Landau
equation in bounded domains are considered. We investigate the effect of the
boundaries on spiral motion under homogeneous Neumann boundary conditions, for
small values of the twist parameter $q$. We derive explicit laws of motion for
rectangular domains and we show that the motion of spirals becomes
exponentially slow when the twist parameter exceeds a critical value depending
on the size of the domain. The oscillation frequency of multiple-spiral
patterns is also analytically obtained.
