PENG, Yingjie. Applications of Calculus in Economics: Marginal Function as an Example. Science and Technology of Engineering, Chemistry and Environmental Protection, [S. l.], v. 3, n. 5, p. 11812, 2025. DOI: 10.61173/5rzswa34. Disponível em: https://stecep.deanfrancis.press/article/view/653. Acesso em: 25 oct. 2026.