Frederic Howell, Vaithianathan Venkatasubramanian. A modal decomposition of the Hopf normal form coefficient. IEEE Trans. Automat. Contr., 46(7):1080-1083, 2001. [doi]
@article{HowellV01,
title = {A modal decomposition of the Hopf normal form coefficient},
author = {Frederic Howell and Vaithianathan Venkatasubramanian},
year = {2001},
doi = {10.1109/9.935059},
url = {http://dx.doi.org/10.1109/9.935059},
researchr = {https://researchr.org/publication/HowellV01},
cites = {0},
citedby = {0},
journal = {IEEE Trans. Automat. Contr.},
volume = {46},
number = {7},
pages = {1080-1083},
}