LEMMA, Mulatu. Matrix Based on the Second Derivative of Infinite Convergent Geometric Series. Journal of Advance Research in Mathematics And Statistics (ISSN 2208-2409), [S. l.], v. 4, n. 3, p. 01–05, 2017. DOI: 10.53555/nnms.v4i3.543. Disponível em: https://nnpub.org/index.php/MS/article/view/543.. Acesso em: 18 may. 2024.