1. N. Abreu, D.M. Cardoso, I. Gutman, E.A. Martins, M. Robbiano, Bounds for the signless Laplacian energy. Lin. Algebra Appl. 435, 2365–2374 (2011)
2. C. Adiga, R. Balakrishnan, W. So, The skew energy of a digraph. Lin. Algebra Appl. 432, 1825–1835 (2010)
3. C. Adiga, Z. Khoshbakht, I. Gutman, More graphs whose energy exceeds the number of vertices. Iran. J. Math. Sci. Inf. 2(2), 13–19 (2007)
4. C. Adiga, M. Smitha. On the skew Laplacian energy of a digraph. Int. Math. Forum 4, 1907–1914 (2009)
5. C. Adiga, M. Smitha, On maximum degree energy of a graph. Int. J. Contemp. Math. Sci. 4, 385–396 (2009)