Complexes of stationary domain walls in the resonantly forced   Ginsburg-Landau equation
  The parametrically driven Ginsburg-Landau equation has well-known stationary solutions -- the so-called Bloch and Neel, or Ising, walls. In this paper, we construct an explicit stationary solution describing a bound state of two walls. We also demonstrate that stationary complexes of more than two walls do not exist. 
I. V. Barashenkov and S. R. Woodford