Variable Neighborhood Search for Extremal Graphs. 16. Some Conjectures Related to the Largest Eigenvalue of a Graph - Aouchiche, Mustapha; Bell, F.K.; Cvetkovic, Dragos; Hansen, Pierre; Rowlinson, Peter; Simic, S; Stevanovic, Dragan (Groupe d’études et de recherche en analyse des décisions, 2006)