STEINOVÁ, Monika. Approximability of the Minimum Steiner Cycle Problem. COMPUTING AND INFORMATICS, [S. l.], v. 29, n. 6+, p. 1349–1357, 2012. Disponível em: https://www.cai.sk/ojs/index.php/cai/article/view/148. Acesso em: 3 may. 2024.