@article{10_4171_ifb_76,
     author = {Shangbin Cui and Avner Friedman},
     title = {A {Hyperbolic} {Free} {Boundary} {Problem} {Modeling} {Tumor} {Growth}},
     journal = {Interfaces and free boundaries},
     pages = {159--182},
     year = {2003},
     volume = {5},
     number = {2},
     doi = {10.4171/ifb/76},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ifb/76/}
}