Weak long-ranged Casimir attraction in colloidal crystalsA. Gopinathan, T. Zhou, S. N. Coppersmith, L. P. Kadanoff and D. G. GrierEurophys. Lett., 57 3 (2002) 451-457DOI: https://doi.org/10.1209/epl/i2002-00481-1
