@article{AFM_1986_11_1_a7,
     author = {J. K. Langley},
     title = {Exceptional sets for linear differential polynomials},
     journal = {Annales Fennici Mathematici},
     pages = {137--153},
     publisher = {mathdoc},
     volume = {11},
     number = {1},
     year = {1986},
     doi = {10.5186/aasfm.1986.1109},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1986.1109/}
}