@article{MZ_1984__187_173465,
     author = {J.K. Langley},
     title = {On {Differential} {Polynomials} and {Results} of {Hayman} and {Doeringer.}},
     journal = {Mathematische Zeitschrift},
     pages = {1--12},
     publisher = {mathdoc},
     volume = {187},
     year = {1984},
     zbl = {0563.30024},
     url = {http://geodesic.mathdoc.fr/item/MZ_1984__187_173465/}
}