no. 2
The irreducibility of compositions of linear polynomials over a finite field
Compositio Mathematica, Tome 47 (1982) no. 2, pp. 149-152. 
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     author = {Cohen, S. D.},
     title = {The irreducibility of compositions of linear polynomials over a finite field},
     journal = {Compositio Mathematica},
     pages = {149--152},
     publisher = {Martinus Nijhoff Publishers},
     volume = {47},
     number = {2},
     year = {1982},
     mrnumber = {677016},
     zbl = {0499.12017},
     language = {en},
     url = {http://www.numdam.org/item/CM_1982__47_2_149_0/}
}
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Cohen, S. D. The irreducibility of compositions of linear polynomials over a finite field. Compositio Mathematica, Tome 47 (1982) no. 2, pp. 149-152. http://www.numdam.org/item/CM_1982__47_2_149_0/

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