no. 2
On the minimum of the unit lattice
Séminaire de théorie des nombres de Bordeaux, Série 2, Tome 3 (1991) no. 2, pp. 377-380. 
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     volume = {Ser. 2, 3},
     number = {2},
     year = {1991},
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     zbl = {0755.11034},
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     url = {http://archive.numdam.org/item/JTNB_1991__3_2_377_0/}
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Kessler, Volker. On the minimum of the unit lattice. Séminaire de théorie des nombres de Bordeaux, Série 2, Tome 3 (1991) no. 2, pp. 377-380. http://archive.numdam.org/item/JTNB_1991__3_2_377_0/

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[3] Dobrowolski, On a question of Lehmer and the number of irreducible factors of a polynomial, Acta arithmetica 34 (1979), 391-401. | MR | Zbl

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[5] , Smyth On the product of the conjugates outside the unit circle of an algebraic integer, Bull. London Math. Soc. 3 (1971), 169-175. | MR | Zbl