@article{10_14712_1213_7243_2015_175,
     author = {Tuyen, Luong Quoc},
     title = {On an affirmative answer to {Y.}  {Tanaka's} and {Y.} {Ge's} problem},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {125--129},
     publisher = {mathdoc},
     volume = {58},
     number = {1},
     year = {2017},
     doi = {10.14712/1213-7243.2015.175},
     mrnumber = {3631685},
     zbl = {06736748},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.14712/1213-7243.2015.175/}
}