Bezkorovaina, L.L. and Vashpanova, T.Y. (2010) “$A$-deformations of a surface with stationary lengths of $LGT$-lines”, Ukrains’kyi Matematychnyi Zhurnal, 62(7), pp. 878–884. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2921 (Accessed: 26 April 2025).