SCHMIDT, Asmus L. Approximation Theorems of Borel and Fujiwara. MATHEMATICA SCANDINAVICA, [S. l.], v. 14, p. 35–38, 1964. DOI: 10.7146/math.scand.a-10703. Disponível em: https://tidsskrift.dk/math/article/view/10703. Acesso em: 14 aug. 2026.