@article{BMMS_2004_27_2_a4,
     author = {Yan Xu},
     title = {Normal {Functions} and {Normal} {Families}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2004},
     volume = {27},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2004_27_2_a4/}
}