HEYER, Herbert. On the Convergence Principle of B.M. Kloss. Mathematica Scandinavica, Berkeley, CA, United States, v. 19, p. 211–216, 1966. DOI: 10.7146/math.scand.a-10811. Disponível em: https://journals.msp.org/mscand/article/view/2531. Acesso em: 25 jul. 2026.