@article{ferrante2012-2,
	author="A. Ferrante and L. Ntogramatzidis",
	title="Comments on Structural Invariant Subspaces of Singular Hamiltonian Systems and Nonrecursive Solutions of Finite-Horizon Optimal Control Problems",
	journal="IEEE Transactions on Automatic Control",
	year="2012",
	pages="270-272",
	volume="57",
	issn="0018-9286",
	note="doi   =   10.1109/TAC.2011.2162894"
}