10.1016/0167-6911(83)90021-X
10.1080/002071700405833
hchmann, 1994, Universal $\lambda$ -tracking for nonlinearly perturbed systems in-the presence of noise, Automatica, 30, 337, 10.1016/0005-1098(94)90035-3
10.1016/0167-6911(91)90050-O
10.1016/S0005-1098(98)00228-3
10.1016/0167-6911(90)90073-4
10.1109/9.286251
10.1016/0167-6911(92)90006-E
10.1109/9.333780
10.1016/0167-6911(93)90044-7
10.1109/9.109644