no. 1-2
Fourier transforms with nonnegative real part
Compositio Mathematica, Tome 18 (1967) no. 1-2, pp. 55-60 
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     author = {Art\'emiadis, Nicolas},
     title = {Fourier transforms with nonnegative real part},
     journal = {Compositio Mathematica},
     pages = {55--60},
     year = {1967},
     publisher = {P. Noordhoff N. V., Groningen},
     volume = {18},
     number = {1-2},
     mrnumber = {219994},
     zbl = {0177.40002},
     language = {en},
     url = {https://www.numdam.org/item/CM_1967__18_1-2_55_0/}
}
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Artémiadis, Nicolas. Fourier transforms with nonnegative real part. Compositio Mathematica, Tome 18 (1967) no. 1-2, pp. 55-60. https://www.numdam.org/item/CM_1967__18_1-2_55_0/

Artémiadis, N. [1] "Sur les transformées de Fourier et leurs applications aux séries et sur les fonctions typiquement réelles, d'ordre p" Annales Sc., de l'Ecole Normale Supérieure, (3), LXXIV. Fasc. 4 1958. | Zbl | Numdam

Artémiadis, N. [2] "Séries de Dirichlet et transformées de Fourier" Bull. Sc. Math., 2e série, 85, 1961, p. 73 à 85. | Zbl | MR

Bochner S., Chandrasekharan [3] "Fourier transforms" Princeton 1949. | Zbl