Oriented unicyclic graphs with extremal skew energy
  Let $\G$ be an oriented graph of order $n$ and $\a_1,\a_2,..., \a_n$ denote all the eigenvalues of the skew-adjacency matrix of $\G.$ The skew energy $\displaystyle{\cal E}_s(\G)= \sum_{i=1}^{n} |\a_i|.$   In this paper, the oriented unicyclic graphs with minimal and maximal skew energy are determined. 
Hou Yaoping, Shen Xiaoling and Zhang Chongyan
math.CO