Maria Chudnovsky Gérard Cornuéjols Xinming Liu Paul D. Seymour Kristina Vuskovic Recognizing Berge Graphs. 143-186 2005 25 Combinatorica 2 http://dx.doi.org/10.1007/s00493-005-0012-8 db/journals/combinatorica/combinatorica25.html#ChudnovskyCLSV05