KHADKA, S. R. Improved Upper Bound to Product Rate Variation Problem. The Nepali Mathematical Sciences Report, [S. l.], v. 37, n. 1-2, p. 47–54, 2020. DOI: 10.3126/nmsr.v37i1-2.34069. Disponível em: https://www.nepjol.info/index.php/nmsr/article/view/34069. Acesso em: 24 oct. 2021.