SHAH, N. P. About Pure and Applied Mathematics. BIBECHANA, [S. l.], v. 3, p. 19–20, 2018. DOI: 10.3126/bibechana.v3i0.19224. Disponível em: https://nepjol.info/index.php/BIBECHANA/article/view/19224. Acesso em: 17 may. 2024.