“…In practice, there are many cases where the plant description can be transformed into strictfeedback form by means of static state feedback and diffeomorphic transformation. Typical examples for such plants include flights (Li, Jing, and Gao 2009), permanent magnet (PM) synchronous motor (Quassaid, Cherkaoui, and Zidani 2004), automatic guidance of farm vehicles (Fang, Lenain, Thuilot, and Martinet 2005) and active suspensions for cars (Yagiz and Hacioglu 2008) etc.…”