BRÜDERN, J; KAWADA, K.; WOOLEY, T. D. Additive representation in thin sequences, V: Mixed problems of Waring’s type. MATHEMATICA SCANDINAVICA, [S. l.], v. 92, n. 2, p. 181–209, 2003. DOI: 10.7146/math.scand.a-14400. Disponível em: https://tidsskrift.dk/math/article/view/14400. Acesso em: 14 aug. 2026.