Alfred Krabbe e Casey, Sean C., First Light SOFIA Instruments, in Proceedings, SPIE conference on Infrared Spaceborne remote Sensing X, Seattle, USA, Dordrecht, D. Reidel Publishing Co., July 2002, Bibcode:2002astro.ph..7417K, arXiv:astro-ph/0207417.
Alfred Krabbe, SOFIA telescope, in Proceedings of SPIE: Astronomical Telescopes and Instrumentation, Munich, Germany, SPIE — The International Society for Optical Engineering, March 2007, pp. 276–281, Bibcode:2000SPIE.4014..276K, DOI:10.1117/12.389103, arXiv:astro-ph/0004253.
doi.org
dx.doi.org
Alfred Krabbe, SOFIA telescope, in Proceedings of SPIE: Astronomical Telescopes and Instrumentation, Munich, Germany, SPIE — The International Society for Optical Engineering, March 2007, pp. 276–281, Bibcode:2000SPIE.4014..276K, DOI:10.1117/12.389103, arXiv:astro-ph/0004253.
Alfred Krabbe e Casey, Sean C., First Light SOFIA Instruments, in Proceedings, SPIE conference on Infrared Spaceborne remote Sensing X, Seattle, USA, Dordrecht, D. Reidel Publishing Co., July 2002, Bibcode:2002astro.ph..7417K, arXiv:astro-ph/0207417.
Alfred Krabbe, SOFIA telescope, in Proceedings of SPIE: Astronomical Telescopes and Instrumentation, Munich, Germany, SPIE — The International Society for Optical Engineering, March 2007, pp. 276–281, Bibcode:2000SPIE.4014..276K, DOI:10.1117/12.389103, arXiv:astro-ph/0004253.