@article{MZ_1994__217_1_174685,
     author = {Leon S. Farhy},
     title = {Trapping obstacles with nonhyperbolic periodic ray, asymptotic behaviour of solutions.},
     journal = {Mathematische Zeitschrift},
     pages = {143--166},
     publisher = {mathdoc},
     volume = {217},
     number = {1},
     year = {1994},
     zbl = {0808.35067},
     url = {http://geodesic.mathdoc.fr/item/MZ_1994__217_1_174685/}
}