1-Dimensional behavior and sliding Luttinger liquid phase in a   frustrated spin-1/2 crossed chain model: contribution of exact   diagonalizations
  Exact diagonalizations indicate that the effective 1-dimensional behavior (sliding Luttinger liquid phase) of the frustrated spin-1/2 crossed chain model, predicted by Starykh, Singh and Levine [Phys. Rev. Lett. 88, 167203 (2002)], persists for a wide range of transverse couplings. The extension of the other phases (plaquette valence bond crystal and N\'eel long range order) is precised. No clear indication of a coexistence of these two phases is found, at variance with a suggestion of Sachdev and Park (cond-mat/0108214). 
P. Sindzingre, J.-B. Fouet, C. Lhuillier