@article{AIHPC_1998__15_4_399_0,
     author = {Berm\'udez, A. and Muniz, M. C. and Quintela, P.},
     title = {Existence of solution for a free boundary problem in a nonlinear piecewise homogeneous medium},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {399--430},
     publisher = {Gauthier-Villars},
     volume = {15},
     number = {4},
     year = {1998},
     mrnumber = {1632913},
     zbl = {0909.35153},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_1998__15_4_399_0/}
}