@article{10_4064_ap101_1_3,
     author = {Xiao-Guang Qi and Lian-Zhong Yang},
     title = {Differential analogues of the {Br\"uck} conjecture},
     journal = {Annales Polonici Mathematici},
     pages = {31--38},
     publisher = {mathdoc},
     volume = {101},
     number = {1},
     year = {2011},
     doi = {10.4064/ap101-1-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap101-1-3/}
}