@article{NUMA_1982__40_132824,
     author = {D. Fage},
     title = {Approximation of {Time-Dependent} {Free} {Boundaries}},
     journal = {Numerische Mathematik},
     pages = {179--200},
     publisher = {mathdoc},
     volume = {40},
     year = {1982},
     zbl = {0489.65070},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1982__40_132824/}
}