Geodesic
Holonomic functions in a~polycircle with nonnegative imaginary part
Matematičeskie zametki, Tome 15 (1974) no. 1, pp. 55-61

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A well-known theorem of Nevanlinna on the representation of nonnegative measure of a function holomorphic in a circle and having nonnegative imaginary part is extended to functions of many complex variables, holomorphic in a polycircle and having there a nonnegative imaginary part. 
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     author = {V. S. Vladimirov and Yu. N. Drozhzhinov},
     title = {Holonomic functions in a~polycircle with nonnegative imaginary part},
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V. S. Vladimirov; Yu. N. Drozhzhinov. Holonomic functions in a~polycircle with nonnegative imaginary part. Matematičeskie zametki, Tome 15 (1974) no. 1, pp. 55-61. http://geodesic.mathdoc.fr/item/MZM_1974_15_1_a5/