Unique maximizers of spectral radius are identified among unbalanced signed bipartite graphs with no negative C4, up to switching isomorphism, for fixed bipartition sizes and order.
Stani´ c, Integral regular net-balanced signed graphs with vertex degree at most four, Ars Math
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Unbalanced signed bipartite graphs containing no negative $C_4$ with maximum spectral radius
Unique maximizers of spectral radius are identified among unbalanced signed bipartite graphs with no negative C4, up to switching isomorphism, for fixed bipartition sizes and order.