On the number of representations of an integer as a sum of primes belonging to given arithmetical progressions
Compositio Mathematica, Tome 15 (1962-1964), pp. 64-69 
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     author = {Zulauf, A.},
     title = {On the number of representations of an integer as a sum of primes belonging to given arithmetical progressions},
     journal = {Compositio Mathematica},
     pages = {64--69},
     year = {1962-1964},
     publisher = {Kraus Reprint},
     volume = {15},
     mrnumber = {137690},
     zbl = {0099.03103},
     language = {en},
     url = {https://www.numdam.org/item/CM_1962-1964__15__64_0/}
}
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Zulauf, A. On the number of representations of an integer as a sum of primes belonging to given arithmetical progressions. Compositio Mathematica, Tome 15 (1962-1964), pp. 64-69. https://www.numdam.org/item/CM_1962-1964__15__64_0/

A. Zulauf [1] Über die Darstellung natürlicher Zahlen als Summen von Primzahlen aus gegebenen Restklassen und Quadraten mit gegebenen Koeffizienten, I: Resultate für genügend groβe Zahlen, Journ. f. Math, 192 (1954), 210-229. | Zbl

[2] - - - ditto, II: Die singuläre Reihe, Journ. f. Math. 193 (1954), 39-53. | MR

[3] - - - ditto, III: Resultate für fast alle Zahlen, Journ. f. Math. 193 (1954), 54-64. | Zbl | MR

J.G. Van Der Corput [4] Über Summen von Primzahlen und Primzahlquadraten, Math. Annalen. 116 (1938), 1-50. | Zbl | JFM