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Petrović in [M. Petrović, On graphs with exactly one eigenvalue less than −1, J. Combin. Theory Ser. B 52 (1991) 102-112] determined all connected graphs with exactly one eigenvalue less than −1 and all minimal graphs with exactly two eigenvalues less than −1. By using these minimal graphs, in this paper, we determine all connected graphs having −1 as an eigenvalue with multiplicity n − 4 or n − 5.doi:10.2298/fil1918919y fatcat:uunjvfyp6vf4higxzgi55arl64