@Article{TAC-16_Xiong-Lanzon-Petersen,
 author       = "Xiong, J. and Lanzon, A. and Petersen, I. R.",
 title        = "Negative imaginary lemmas for descriptor systems",
 journal      = "{IEEE} Transactions on Automatic Control",
 volume       = 61,
 number       = 2,
 pages        = "491-496",
 doi          = "10.1109/TAC.2015.2444233",
 month        = feb,
 year         = 2016}