%0 Journal Article %A Stillinger, F.H. %A Torquato, S. %T New conjectural lower bounds on the optimal density of sphere packings. %J Experimental mathematics %D 2006 %P 307-331 %V 15 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/EXMA_2006__15_3_232416/ %G en %F EXMA_2006__15_3_232416