BEZKOROVAINA, L. L.; VASHPANOVA, T. Yu. $A$-deformations of a surface with stationary lengths of $LGT$-lines. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 62, n. 7, p. 878–884, 2010. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2921. Acesso em: 27 apr. 2025.