@article{CRMATH_2011__349_21-22_1159_0,
     author = {Xu, Yan and Qiu, Huiling},
     title = {An avoidance criterion for normal functions},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {1159--1160},
     publisher = {Elsevier},
     volume = {349},
     number = {21-22},
     year = {2011},
     doi = {10.1016/j.crma.2011.10.018},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2011.10.018/}
}