@article{EJDE_1999__1999__a132,
     author = {Efendiev,  M.A. and Schmitz,  Hermann and Wendland,  Wolfgang L.},
     title = {On some nonlinear potential problems},
     journal = {Electronic journal of differential equations},
     year = {1999},
     volume = {1999},
     zbl = {0923.35058},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_1999__1999__a132/}
}