PANKOV, M. Irregular subsets of the Grassmannian manifolds and their maps. Математическая физика, анализ, геометрия, Харків, Україна, v. 7, n. 3, p. 331–344, 2000. Disponível em: https://mag.ilt.kharkiv.ua/index.php/mag/article/view/m07-0331e. Acesso em: 21 лис. 2024.