1. Wu, F., [Structure design of antenna pedestal], Xi’an Dianzi university press, Xi’an, 23-162 (1986).
2. The effelsberg 100-m radio telescope
3. The Green Bank Telescope,;Prestage,2009
4. Update on slip and wear in multi-layer azimuth track systems,;Gunjeet,2006
5. Slip and wear in multilayer azimuth track systems,;Frank,2004