1. Development methods of controller used in “automatic guidance system”;Laine,1994
2. Erbach TC, Choi CH, Noh K. Automated guidance for agricultural tractors. In: Proceeding automated agriculture for the 21st century. ASAE Publication No. 11-91, 1991, p. 182–91
3. An automatic guidance system for off-road vehicles;Grovum;Trans. ASAE,1970
4. Design and performance of a steering control system or agricultural tractors;Julian;J. Agric. Eng. Res.,1971
5. O'Connor M, Bell T, Elkaim G, Parkinson B. Automatic steering of farm vehicles using GPS. Paper presented at the 3rd International Conference on Precision Agriculture, 1996 June 23–26; Minneapolis, MN