PLOTKIN, B. I. Some Problems in Nonclassical Algebraic Geometry. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 54, n. 6, p. 841–846, 2002. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4120. Acesso em: 5 dec. 2025.