DENBEL, D. G. Students Difficulties of Solving Inequalities in Calculus. American Scientific Research Journal for Engineering, Technology, and Sciences, [S. l.], v. 5, n. 1, p. 57–62, 2013. Disponível em: https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/761. Acesso em: 28 apr. 2024.