Arkhipov, G.I. (1975). "A mean value theorem of the module of a multiple trigonometric sum". Math. Notes. 17 (1): 143–153. doi:10.1007/BF01093850. S2CID121762464.
Arkhipov, G.I. (1975). "A mean value theorem of the module of a multiple trigonometric sum". Math. Notes. 17 (1): 143–153. doi:10.1007/BF01093850. S2CID121762464.