Spectral generalizations of line graphs: on graphs with least negative eigenvalue -2 by Rowlinson, Peter, Cvetković, Dragoš M., Simic, Slobodan, Rowlingson, Peter fromLondon Mathematical Society lecture note series 0 Type: Book Introduction -- Forbidden subgraphs -- Root systems -- Regular graphs -- Star complements -- The Maximal exceptional graphs -- Miscellaneous results.