A novel subspace identification approach with enforced causal models.

S. Joe Qin Weilu Lin Lennart Ljung A novel subspace identification approach with enforced causal models. 2043-2053 2005 41 Automatica 12 http://dx.doi.org/10.1016/j.automatica.2005.06.010 db/journals/automatica/automatica41.html#QinLL05