Aminov, Y., & Gontcharova, O. (1999). An example of isometric immersion of a domain of 3-dimensional Lobachevsky space into E⁶ with a section as the Veronese surface. Математическая физика, анализ, геометрия, 6(1-2), 3–9. вилучено із https://mag.ilt.kharkiv.ua/index.php/mag/article/view/m06-0003e