Geodesic
Enlarged major arcs in additive problems.~II
Informatics and Automation, Number theory, algebra, and analysis, Tome 276 (2012), pp. 182-197.

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Enlarged major arcs of the circle method are treated, and as consequences new bounds for the exceptional sets in the Waring–Goldbach problem for fourth and fifth powers are obtained. 
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Jianya Liu. Enlarged major arcs in additive problems.~II. Informatics and Automation, Number theory, algebra, and analysis, Tome 276 (2012), pp. 182-197. http://geodesic.mathdoc.fr/item/TRSPY_2012_276_a14/

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