1. ESA Websites: http://astro.estec.esa.n1/FIRST and http://astro.estec.esa.n1/Planck
2. STEINZ, J. A. “The FIRST Project,” Proceedings of ESA Symposium: The Far Infrared and Submillimetre Universe, 15–17 April 1997, ESA.SP.401, August 1997.
3. PILBRATT, G. “The FIRST Mission: Baseline Science Objectives and Operations,” Proceedings of ESA Symposium: The Far Infrared and Submillimetre Universe, 15–17 April 1997, ESA.SP.401, August 1997.
4. WHYBORN, N. D. “The HIFI Heterodyne Instrument for FIRST: Capabilities and Performance,” Proceedings of ESA Symposium: The Far Infrared and Submillimetre Universe, 15–17 April 1997, ESA.SP.401, August 1997.
5. POGLITSCH, A. “An Optimised Photo-Conductor Instrument for FIRST,” Proceedings of ESA Symposium: The Far Infrared and Submillimetre Universe, 15–17 April 1997, ESA.SP.401, August 1997.