@article{MOMA_1998__125_4_178798,
     author = {Ping Li and Chung-Chau Yang},
     title = {On the {Value} {Distribution} of a {Certain} {Type} of {Differential} {Polynomials.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {15--24},
     year = {1998},
     volume = {125},
     number = {4},
     zbl = {0902.30023},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1998__125_4_178798/}
}