Graphs whose vertices of degree at least 2 lie in a triangle Vinicius L. do Forte, Min Chih Lin, Abilio Lucena, Nelson Maculan, Veronica A. Moyano and Jayme L. Szwarcfiter RAIRO-Oper. Res., 58 6 (2024) 5063-5077 Published online: 06 December 2024 DOI: 10.1051/ro/2024198