Extremal unbalanced signed graphs free of tK4- are characterized as those achieving maximum spectral radius and index on n vertices.
Harary, On the notion of balance of a signed graph, Michigan Math
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Spectral Tur\'an problem for $t\mathcal{K}_{4}^{-}$-free unbalanced signed graphs
Extremal unbalanced signed graphs free of tK4- are characterized as those achieving maximum spectral radius and index on n vertices.