1. Federal Communications Commission 2012 http://www.ntia.doc.gov/files/ntia/publications/lightsquared_letter_to_chairman_genachowski_-_feb_14_2012.pdf
2. United States Federal Communications Commission FCC-04-168A1 Report and Order, Fifth Report and Order, Fourth Memorandum Opinion and Order, and Order 2004 http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-04-168A1.pdf
3. The Early History of Radio: from Faraday to Marconi