%0 Journal Article %A X. Y. Lu %T Bifurcation condition for optimal sets of the average distance functional %J Nanosistemy: fizika, himiâ, matematika %D 2011 %P 51-60 %V 2 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/NANO_2011_2_4_a3/ %G en %F NANO_2011_2_4_a3