Reduced-Order Kalman Filter with Unknown Inputs.

J. Y. Keller Mohamed Darouach Reduced-Order Kalman Filter with Unknown Inputs. 1463-1468 1998 34 Automatica 11 http://dx.doi.org/10.1016/S0005-1098(98)00094-6 db/journals/automatica/automatica34.html#KellerD98