Gor’kavyiVA, Nevmerzhitskaya EN. Two-dimensional pseudospherical surfaces with degenerate Bianchi transformation. Ukr. Mat. Zhurn. [Internet]. 2011Nov.25 [cited 2024Nov.23];63(11):1460-8. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/2818