Calculus of Infinitesimals and Ultra Real Numbers: Exploring Infinitesimals and Ultra Real Numbers in Calculus. Journal of Advances and Scholarly Researches in Allied Education, [S. l.], v. 16, n. 4, p. 1519–1521, 2019. Disponível em: https://ignited.in/index.php/jasrae/article/view/10686. Acesso em: 13 mar. 2026.