Deconfinement phase transition in a two-dimensional model of interacting 2 × 2 plaquettes A. Fledderjohann, A. Klümper and K.-H. Mütter Eur. Phys. J. B, 72 4 (2009) 559-565 Published online: 20 November 2009 DOI: 10.1140/epjb/e2009-00389-6