%0 Journal Article %A Yu. E. Hohlov %A D. V. Prokhorov %A A. Yu. Vasil'ev %T On geometrical properties of free boundaries in the Hele--Shaw flows moving boundary problem %J Lobachevskii journal of mathematics %D 1998 %P 3-12 %V 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/LJM_1998_1_a0/ %G en %F LJM_1998_1_a0