The Effective Potential in the Massive $\phi_4^4$ Model
  By applying the renormalization group equation, it has been shown that the effective potential $V$ in the massless $\phi_4^4$ model and in massless scalar quantum electrodynamics is independent of the scalar field. This analysis is extended here to the massive $\phi_4^4$ model, showing that the effective potential is independent of $\phi$ here as well. 
F. T. Brandt, F. A. Chishtie, D.G.C. McKeon