A detection method of symmetry restoration process of attractor merging crisis T. Mizuguchi, M. Yomosa, N. Fujiwara and M.U. Kobayashi Eur. Phys. J. B, 85 7 (2012) 230 Published online: 03 July 2012 DOI: 10.1140/epjb/e2012-21037-0