@article{CMUC_1999_40_1_a8,
     author = {Tang, Wee-Kee},
     title = {On {Asplund} functions},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {121--132},
     year = {1999},
     volume = {40},
     number = {1},
     mrnumber = {1715206},
     zbl = {1060.46505},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1999_40_1_a8/}
}