@article{10_4171_ifb_208,
     author = {Roberto Argiolas and Fausto Ferrari},
     title = {Flat free boundaries regularity in two-phase problems for a class of fully nonlinear elliptic operators with variable coefficients},
     journal = {Interfaces and free boundaries},
     pages = {177--199},
     year = {2009},
     volume = {11},
     number = {2},
     doi = {10.4171/ifb/208},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ifb/208/}
}