Hyun-Gwang Cho and Wan-Seok Yang and Su-Jin Kim and Jeong-Seok Oh and Chun-Hong Park, Error Factors in Vertical Positioning System. journal = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology. November 2011, vol. 59(11). 2223 - 2228 [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/15233.