1. PORTA: www.iwr.uni-heidelberg.de/groups/comopt/software/PORTA.
2. Perfect graphs;Berge,1963
3. S. Bianchi, M. Escalante, G. Nasini, Some forbidden subgraphs for LS+-perfection, in: Annals of the Latin-Iberoamerican Conference on Operations Research, CLAIO, 2016.
4. Near-perfect graphs with polyhedral N+(G);Bianchi;Electron. Notes Discrete Math.,2011
5. Lovász–Schrijver PSD-operator and a superclass of near-perfect graphs;Bianchi;Electron. Notes Discrete Math.,2013