@article{10_4171_ifb_142,
     author = {Avner Friedman},
     title = {A free boundary problem for a coupled system of elliptic, hyperbolic, and {Stokes} equations modeling tumor growth},
     journal = {Interfaces and free boundaries},
     pages = {247--261},
     year = {2006},
     volume = {8},
     number = {2},
     doi = {10.4171/ifb/142},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ifb/142/}
}