Interaction properties of the periodic and step-like solutions of the double-Sine-Gordon equationMarzieh Peyravi, Afshin Montakhab, Nematollah Riazi and Abdorrasoul GharaatiEur. Phys. J. B, 72 2 (2009) 269-277DOI: https://doi.org/10.1140/epjb/e2009-00331-0