On oriented graphs whose skew spectral radii do not exceed 2

Let S(Gσ)S(Gσ) be the skew adjacency matrix of the oriented graph GσGσ of order n   and λ1,λ2,…,λnλ1,λ2,…,λn be all eigenvalues of S(Gσ)S(Gσ). The skew spectral radius ρs(Gσ)ρs(Gσ) of GσGσ is defined as max{|λ1|,|λ2|,…,|λn|}max{|λ1|,|λ2|,…,|λn|}. In this paper, we investigate oriented graphs whose skew spectral radii do not exceed 2.