%0 Journal Article %A Avner Friedman %T A free boundary problem for a coupled system of elliptic, hyperbolic, and Stokes equations modeling tumor growth %J Interfaces and free boundaries %D 2006 %P 247-261 %V 8 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4171/ifb/142/ %R 10.4171/ifb/142 %F 10_4171_ifb_142