FOLNER, Erling. Generalization of the general Diophantine approximation theorem of Kronecker. MATHEMATICA SCANDINAVICA, [S. l.], v. 68, p. 148–160, 1991. DOI: 10.7146/math.scand.a-12352. Disponível em: https://tidsskrift.dk/math/article/view/12352. Acesso em: 14 aug. 2026.