@article{AFM_2021_46_1_a34,
     author = {Zhenghua Xu},
     title = {Another look at the {Landau} theorem},
     journal = {Annales Fennici Mathematici},
     pages = {581--585},
     publisher = {mathdoc},
     volume = {46},
     number = {1},
     year = {2021},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AFM_2021_46_1_a34/}
}