Disordered spherical bead packs are anisotropicG. E. Schröder-Turk, W. Mickel, M. Schröter, G. W. Delaney, M. Saadatfar, T. J. Senden, K. Mecke and T. AsteEPL, 90 3 (2010) 34001DOI: https://doi.org/10.1209/0295-5075/90/34001