BOYKO, O.; KALIUZHNYI-VERBOVETSKYI, D.; PIVOVARCHIK, V. Non-existence of co-spectral simple connected graphs with small number of edges. Carpathian Mathematical Publications, [S. l.], v. 18, n. 1, p. 99–110, 2026. DOI: 10.15330/cmp.18.1.99-110. Disponível em: https://journals.pnu.edu.ua/index.php/cmp/article/view/8892. Acesso em: 14 may. 2026.