MathSciNet bibliographic data MR1093089 93E11 (93B36 93E14) Nagpal, Krishan M.; Khargonekar, Pramod P. Filtering and smoothing in an $H\sp \infty$$H\sp \infty$ setting. IEEE Trans. Automat. Control 36 (1991), no. 2, 152–166. Article

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