@Article{JMEA-12_Mabrok-Kallapur-Petersen-Lanzon,
 author       = "Mabrok, M. A. and Kallapur, A. G. and Petersen, I. R. and Lanzon, A.",
 title        = "Generalized negative imaginary lemma for descriptor systems",
 journal      = "Journal of Mechanics Engineering and Automation",
 volume       = 2,
 number       = 1,
 pages        = "17-21",
 month        = jan,
 year         = 2012}