A numerical study of the formation of magnetisation plateaus in quasi   one-dimensional spin-1/2 Heisenberg models
  We study the magnetisation process of the one dimensional spin-1/2 antiferromagnetic Heisenberg model with modulated couplings over j=1,2,3 sites. It turns out that the evolution of magnetisation plateaus depends on j and on the wave number q of the modulation according to the rule of Oshikawa, et al. A mapping of two- and three-leg zig-zag ladders on one dimensional systems with modulated couplings yields predictions for the occurence of magnetization plateaus. The latter are tested by numerical computations with the DMRG algorithm. 
R.M. Wiessner, A. Fledderjohann, K.-H.Muetter, and M. Karbach