@Inproceedings{ifac-11_Mabrok-Kallapur-Petersen-Lanzon,
 author       = "Mabrok, M. and Kallapur, A. G. and Petersen, I. R. and Lanzon, A.",
 title        = "Spectral conditions for the negative imaginary property of transfer function matrices",
 booktitle    = "Proceedings of the 18th {IFAC} World Congress",
 address      = "Milan, Italy",
 pages        = "1302-1306",
 doi          = "10.3182/20110828-6-IT-1002.00714",
 month        = sep,
 year         = 2011}