On exceptional values of entire and meromorphic functions
Compositio Mathematica, Tome 13 (1956-1958), pp. 150-158. 
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     author = {Ahmad, Mansoor},
     title = {On exceptional values of entire and meromorphic functions},
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     pages = {150--158},
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     url = {http://archive.numdam.org/item/CM_1956-1958__13__150_0/}
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Ahmad, Mansoor. On exceptional values of entire and meromorphic functions. Compositio Mathematica, Tome 13 (1956-1958), pp. 150-158. http://archive.numdam.org/item/CM_1956-1958__13__150_0/

S.M. Shah [1] On exceptional values of entire functions, Compositio Mathematica 9 (1951), 227-238. | Numdam | MR | Zbl

R. Nevanlinna [2], [8], Fonctions Meromorphes (Paris, 1929).

Mansoor Ahmad [4] On exceptional values of entire functions of infinite order, Indian Math. Soc. Journal, Vol. XVIII (1954), 19-21. | MR | Zbl