Arching during the segregation of two-dimensional tapped granular systems: Mixtures versus intrudersRodolfo Omar Uñac, Jesica G. Benito, Ana María Vidales and Luis A. PugnaloniEur. Phys. J. E, 37 11 (2014) 117DOI: https://doi.org/10.1140/epje/i2014-14117-y