@article{10_1007_s10492_013_0033_3,
     author = {Pan, Jiaqing},
     title = {On an over-determined problem of free boundary of a degenerate parabolic equation},
     journal = {Applications of Mathematics},
     pages = {657--671},
     publisher = {mathdoc},
     volume = {58},
     number = {6},
     year = {2013},
     doi = {10.1007/s10492-013-0033-3},
     mrnumber = {3162753},
     zbl = {06312920},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10492-013-0033-3/}
}