Extremal unbalanced signed graphs free of tK4- are characterized as those achieving maximum spectral radius and index on n vertices.
Zaslavsky, Matrices in the theory of signed simple graphs, in Advances in Discrete Mathematics and Applications: Mysore, 2008, 207–229, Ramanujan 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.