%0 Journal Article %A P. Ebenfelt %A D. Khavinson %A H.S. Shapiro %T A free boundary problem related to single-layer potentials %J Annales Fennici Mathematici %D 2002 %P 21-46 %V 27 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/AFM_2002_27_1_a2/ %G en %F AFM_2002_27_1_a2