%0 Journal Article %A L. P. Vlasov %T “Suns” and geometric properties of the unit sphere in a Banach space %J Trudy Instituta matematiki i mehaniki %D 1998 %P 247-253 %V 5 %U http://geodesic.mathdoc.fr/item/TIMM_1998_5_a17/ %G en %F TIMM_1998_5_a17