THE FIRST QUADRATIC FORM OF A SURFACE AND ITS APPLICATIONS. Multidisciplinary Journal of Science and Technology, [S. l.], v. 6, n. 5, p. 137–142, 2026. Disponível em: https://www.mjstjournal.universalpublishings.com/index.php/mjst/article/view/7354. Acesso em: 19 may. 2026.