BRUN, V.; KNUDSEN, F. F. On the Possibility of Finding Certain Criteria for the Irrationality of a Number Defined as a Limit of a Sequence of Rational Numbers. MATHEMATICA SCANDINAVICA, [S. l.], v. 31, p. 231–236, 1972. DOI: 10.7146/math.scand.a-11429. Disponível em: https://www.mscand.dk/article/view/11429. Acesso em: 6 may. 2024.