A nonadiabatic semi-classical method for dynamics of atoms in optical latticesS. Jonsell, C. M. Dion, M. Nylén, S. J.H. Petra, P. Sjölund and A. KastbergEur. Phys. J. D, 39 1 (2006) 67-74DOI: https://doi.org/10.1140/epjd/e2006-00082-6