Sulaiman, S. F.; Rahmat, M. F.; Mohd Faudzi, A. A.; Osman, K.; Sunar, N.; Syed Salim, S. N. Hammerstein Model Based RLS Algorithm for Modeling the Intelligent Pneumatic Actuator (IPA) System. Int. J. Adv. Sci. Eng. Inf. Technol. 2017, 7, 1457-1463.