T. Kailath, A. H. Sayed, B. Hassibi. Linear Estimation [M]. Englewood Cliffs: Prentice-Hall, 1999.
B. D. O. Anderson, J. B. Moore. Optimal Filtering [M]. Englewood Cliffs: Prentice-Hall, 1979.
K. M. Nagpal, P. P. Khargonekar. Filtering and smoothing in an H∞ setting [J]. IEEE Trans. on Automatic Control, 1991,36(2): 152–166.
U. Shaked. H∞ optimal estimation-Old and new result [C]// Proc. of the 11th Brazilian Automatic Control Conf. Uberlandia, MG, Brasil, 1998.
G. Zames. Feedback and optimal sensitivity: Model reference transformations, multiplicative seminorms, and approximate inverses [J]. IEEE Trans. on Automatic Control, 1981,26(2): 301–320.
M. J. Grimble. H∞ fixed-lag smoothing filter for scalar systems [J]. IEEE Trans. on Signal Processing, 1991,39(9): 1955–1963.
Y. Theodor, U. Shaked. Game theory approach to H∞ optimal discrete-time fixed-point and fixed-lag smoothing [J] IEEE Trans. on Automatic Control, 1994, 39(9): 1944–1948.
P. Colaneri. A. Ferrante. A J-spectral factorization approach for H∞ estimation problem in discrete time [J]. IEEE Trans. on Automatic Control, 2002,47(2):2108–2113.
L. Mirkin. Continuous-time fixed-lag smoothing in an H∞ setting [C]// Proc.Jþ IEEE Conf. on Decision and Control. Orlando, Florida USA, 2001:3512-3517.
H. Zhang, L. Xie, Y. C. Soh. A unified approach to linear estimation for discrete-time systems-part II: H∞, estimation [C] // Proc. of 41th IEEE Conf. Decision and Control. Las Vagas, Nevada, USA 2002.
[11]B. Hassibi, A. H. Sayed, T. Kailath. Indefinite quadratic estimation and control: A unified approach to H2 and H∞, Theories [M]// SIAM Studies in Applied Mathematics series, USA: SIAM, 1998.