ZORII, N. V. Necessary and Sufficient Conditions for the Solvability of the Gauss Variational Problem. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 57, n. 1, p. 60–83, 2005. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3574. Acesso em: 6 dec. 2025.