Universality in a Class of Q-Ball Solutions: An Analytic Approach
  The properties of Q-balls in the general case of a sixth order potential have been studied using analytic methods. In particular, for a given potential, the initial field value that leads to the soliton solution has been derived and the corresponding energy and charge have been explicitly evaluated. The proposed scheme is found to work reasonably well for all allowed values of the model parameters. 
T.A. Ioannidou, A. Kouiroukidis, N.D. Vlachos