- Jianfeng Wang, Yufa Shen and Qiongxiang Huang
*Notes on graphs with least eigenvalue at least -2,*

Electron. J. Linear Algebra 23 (2012) 387-396. - Xiagang Liu and Sanming Zhou
*Spectral characterizations of propeller graphs.*

Electron. J. Linear Algebra 27 (2014) pp. 19-38.