7Zhang Q,Reid J F,Wu D.Hardware-in-the-loop simulator of an off-road vehicle electrohydraulic steering system[J].Transactions of the ASAE,2000,43 (6):1323 -1330.
8Zhu Zhongxiang,Jun-ichi TAKEDA,Ryo TORISU.Autonomous guidance of tractor along arbitrary paths on sloped terrain[J].Journal of the Japanese Society of Agricultural Machinery,2005,(6):86-92.