@article{pavon2006,
	author="M. Pavon and A. Ferrante",
	title="On the Georgiou-Lindquist Approach to Constrained Kullback-Leibler Approximation of Spectral Densities",
	journal="IEEE Transactions on Automatic Control",
	year="2006",
	pages="639-644",
	volume="51 N. 4",
	issn="0018-9286"
}