Soliton-like excitations and solectrons in two-dimensional nonlinear lattices A. P. Chetverikov, W. Ebeling and M. G. Velarde Eur. Phys. J. B, 80 2 (2011) 137-145 Published online: 14 January 2011 DOI: 10.1140/epjb/e2010-10604-0