Charge density plateaux and insulating phases in the t-J model with ladder geometry A. Fledderjohann, A. Langari and K.-H. Mütter Eur. Phys. J. B, 36 2 (2003) 193-202 Published online: 08 December 2003 DOI: 10.1140/epjb/e2003-00335-8