SHEKUTKOVSKI, Nikita; VASILEVSKA, Violeta. TWO APPROACHES TO PROPER SHAPE THEORY. Matematichki Bilten, [S. l.], v. 21, n. 1, p. 51–66, 1997. Disponível em: https://bilten.smm.org.mk/index.php/bilten/article/view/1577. Acesso em: 14 aug. 2026.