Y. Genin, P. Van-dooren, T. Kailath, J. Delosme, and M. Morf, On ???-lossless transfer functions and related questions, Linear Algebra and its Applications, vol.50, pp.251-275, 1983.
DOI : 10.1016/0024-3795(83)90058-7

B. Hanzon and R. J. Ober, Overlapping block-balanced canonical forms for various classes of linear systems, Linear Algebra and its Applications, vol.281, issue.1-3, pp.171-225, 1998.
DOI : 10.1016/S0024-3795(98)10056-3

B. Hanzon, M. Olivi, and R. L. Peeters, Balanced realizations of discrete-time stable all-pass systems and the tangential Schur algorithm, Linear Algebra and its Applications, vol.418, issue.2-3, pp.793-820, 2004.
DOI : 10.1016/j.laa.2006.03.027
URL : https://hal.archives-ouvertes.fr/inria-00546784

M. L. Hautus, Controllability and observability conditions of linear autonomous systems, Indagationes Mathematicae, vol.31, pp.443-448, 1969.

U. Helmke and J. Moore, Optimization and Dynamical Systems, 1993.

R. Peeters, B. Hanzon, and M. Olivi, Canonical lossless state-space systems: Staircase forms and the Schur algorithm, Linear Algebra and its Applications, vol.425, issue.2-3, pp.404-433, 2007.
DOI : 10.1016/j.laa.2006.09.029
URL : https://hal.archives-ouvertes.fr/inria-00546790