Iorio, L. (2007). "An assessment of the measurement of the Lense–Thirring effect in the Earth gravity field, in reply to: "On the measurement of the Lense–Thirring effect using the nodes of the LAGEOS satellites, in reply to "On the reliability of the so far performed tests for measuring the Lense–Thirring effect with the LAGEOS satellites" by L. Iorio," by I. Ciufolini and E. Pavlis". Planetary and Space Science. 55 (4): 503–511. arXiv:gr-qc/0608119. Bibcode:2007P&SS...55..503I. doi:10.1016/j.pss.2006.08.001.
Iorio, L. (2009). Recent Attempts to Measure the General Relativistic Lense–Thirring Effect with Natural and Artificial Bodies in the Solar System. Vol. 017. Proceedings of Science PoS (ISFTG). arXiv:0905.0300. Bibcode:2009ftg..confE...1I.
Iorio, L. (2007). "An assessment of the measurement of the Lense–Thirring effect in the Earth gravity field, in reply to: "On the measurement of the Lense–Thirring effect using the nodes of the LAGEOS satellites, in reply to "On the reliability of the so far performed tests for measuring the Lense–Thirring effect with the LAGEOS satellites" by L. Iorio," by I. Ciufolini and E. Pavlis". Planetary and Space Science. 55 (4): 503–511. arXiv:gr-qc/0608119. Bibcode:2007P&SS...55..503I. doi:10.1016/j.pss.2006.08.001.
Iorio, L. (2007). "An assessment of the measurement of the Lense–Thirring effect in the Earth gravity field, in reply to: "On the measurement of the Lense–Thirring effect using the nodes of the LAGEOS satellites, in reply to "On the reliability of the so far performed tests for measuring the Lense–Thirring effect with the LAGEOS satellites" by L. Iorio," by I. Ciufolini and E. Pavlis". Planetary and Space Science. 55 (4): 503–511. arXiv:gr-qc/0608119. Bibcode:2007P&SS...55..503I. doi:10.1016/j.pss.2006.08.001.
Iorio, L. (2009). Recent Attempts to Measure the General Relativistic Lense–Thirring Effect with Natural and Artificial Bodies in the Solar System. Vol. 017. Proceedings of Science PoS (ISFTG). arXiv:0905.0300. Bibcode:2009ftg..confE...1I.
"Frequently asked Questions". Gravity Probe B. Stanford University. Answers to Spacecraft and Mission Operations Questions: 1. When and where was GP-B launched, and where can I find photos, video or news clips of the launch?. Retrieved 14 May 2009.
"Frequently asked Questions". Gravity Probe B. Stanford University. Answers to Spacecraft and Mission Operations Questions: 4. Where is the GP-B Mission Operations Center (MOC) for controlling the spacecraft in orbit?. Retrieved 14 May 2009.