BOSOV, A. A. SYMMETRIC DIFFERENCE OF SETS AND ITS APPLICATION. Science and Transport Progress , [S. l.], n. 4, p. 92–95, 2004. DOI: 10.15802/stp2004/20653. Disponível em: https://stp.ust.edu.ua/article/view/20653. Acesso em: 18 jun. 2025.