PASCHOS, Vangelis Th. An overview on polynomial approximation of NP-hard problems. Yugoslav Journal of Operations Research, [S. l.], v. 19, n. 1, p. 3–40, 2009. DOI: 10.2298/YJOR0901003P. Disponível em: https://yujor.erc.fon.bg.ac.rs/index.php/yujor/article/view/251. Acesso em: 26 aug. 2025.