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: http://www.jarm-s.com/index.php/MS/article/view/13.. Acesso em: 10 jul. 2025.