Robert N. Shorten, Paul Curran, Kai Wulff, Ezra Zeheb. A Note on Spectral Conditions for Positive Realness of Transfer Function Matrices. IEEE Trans. Automat. Contr., 53(5):1258-1261, 2008. [doi]
@article{ShortenCWZ08,
title = {A Note on Spectral Conditions for Positive Realness of Transfer Function Matrices},
author = {Robert N. Shorten and Paul Curran and Kai Wulff and Ezra Zeheb},
year = {2008},
doi = {10.1109/TAC.2008.919553},
url = {http://dx.doi.org/10.1109/TAC.2008.919553},
researchr = {https://researchr.org/publication/ShortenCWZ08},
cites = {0},
citedby = {0},
journal = {IEEE Trans. Automat. Contr.},
volume = {53},
number = {5},
pages = {1258-1261},
}