Bezkorovaina LL, Vashpanova TY. $A$-deformations of a surface with stationary lengths of $LGT$-lines. Ukr. Mat. Zhurn. [Internet]. 2010Jul.25 [cited 2024Nov.23];62(7):878–884. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/2921