Geodesic
Behavior of the logarithm of the modulus value of the sum of a Dirichlet series converging in a half-plane
Izvestiya. Mathematics, Tome 45 (1995) no. 1, pp. 175-186 
A. M. Gaisin. Behavior of the logarithm of the modulus value of the sum of a Dirichlet series converging in a half-plane. Izvestiya. Mathematics, Tome 45 (1995) no. 1, pp. 175-186. http://geodesic.mathdoc.fr/item/IM2_1995_45_1_a7/
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Voir la notice de l'article provenant de la source Math-Net.Ru

A stronger version of the well-known theorem of Hayman concerning the minimum modulus of an entire function of infinite order defined by a lacunary power series is proved for series converging only in the unit disc or in a half-plane.

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