(1)
Bodlaender, H.; Bonnet, Édouard; Jaffke, L.; Knop, D.; Lima, P.; Milanič, M.; Ordyniak, S.; Pandey, S.; Suchý, O. Treewidth Is NP-Complete on Cubic Graphs. Electron. J. Combin. 2025, 32, P3.36.