1218628 LQR linear quadratic regulator 129 1218626 LQR longitudinal qualitative research 12 1218627 LQR linear quadratic optimal controller 2 1218635 LQR low-quality roughage 2 1218641 LQR Liandou Qingmai Recipe 1 1218634 LQR linear feedback control design based on quadratic regulators 1 1218632 LQR linear quadratic control strategy 1 1218633 LQR linear quadratic feedback control 1 1218629 LQR linear quadratic regulator algorithm 1 1218630 LQR linear quantile regression 1 1218631 LQR logistic quantile regression 1 1218636 LQR low-quality responding 1 1218637 LQR low-quality roughage treatment 1 1218638 LQR lower quartile ranking 1 1218639 LQR LQ ratio 1 1218640 LQR LQ rejection 1