GREGORICS, Tibor. Force of summation. Teaching Mathematics and Computer Science, [S. l.], v. 12, n. 2, p. 185–199, 2014. DOI: 10.5485/TMCS.2014.0365. Disponível em: https://ojs.lib.unideb.hu/tmcs/article/view/14955. Acesso em: 27 sep. 2024.