Dynamics of systems with isotropic competing interactions in an external field: a Langevin approach R. Díaz-Méndez, A. Mendoza-Coto, R. Mulet, L. Nicolao and D. A. Stariolo Eur. Phys. J. B, 81 3 (2011) 309-319 Published online: 07 June 2011 DOI: 10.1140/epjb/e2011-20185-y